Self-Employed Taxes: The 1099 Survival Guide (2026 Edition)

Going from a W-2 paycheck to a 1099 gross payment feels like a raise. Then April arrives and roughly a third of it is gone. The shock is structural, not bad luck: U.S. tax law shifts a large share of the wage-earner bargain onto your shoulders the moment you are no longer somebody's employee. You owe the same income tax you always did, plus a new 15.3% self-employment tax, plus four payment deadlines that nobody automatically meets for you, plus the responsibility of computing your own taxable income on a form (Schedule C) that has fifty lines and treats deductible expenses very differently from how a normal person thinks about money.

The reward is that the same code that imposes those obligations also gives back. A self-employed person who tracks expenses correctly, makes the right retirement-plan choice, claims the QBI deduction, and pays quarterly on time will usually pay a lower effective rate than the W-2 worker earning the same gross amount — sometimes by ten percentage points or more.^[1] This guide is the playbook that turns that math from a possibility into a routine.

Every dollar figure below is for tax year 2026, sourced to a primary IRS or SSA publication, and verified against the changes the One Big Beautiful Bill Act^[2] made to §199A and to expensing thresholds. When you are ready to plug your own numbers, the CalcLeap self-employment tax calculator and the 1099 total-tax calculator handle the arithmetic.

What changes the moment you go 1099

The IRS uses "self-employed" loosely to cover anyone who earns income outside the W-2 employment relationship: independent contractors paid on Form 1099-NEC, gig workers paid on 1099-K, sole proprietors, single-member LLC owners (treated as disregarded entities by default), partners in a partnership, and members of multi-member LLCs. The tax treatment differs at the margins but the structural shifts below are uniform.

The first row is where everyone underestimates the impact. A W-2 worker sees 7.65% deducted from their paycheck for FICA and (correctly) thinks of that as the cost. The employer's matching 7.65% is invisible — it leaves the employer's bank account on the same day, but it never appears on the worker's pay stub or W-2 Box 1. As a 1099 contractor, you are economically both employer and employee for FICA purposes, so you owe both halves. This is the "self-employment tax" and it is the single biggest reason 1099 income feels different from W-2 income at the same gross dollar amount.

The 15.3% self-employment tax

Self-employment (SE) tax is the SECA (Self-Employment Contributions Act) equivalent of FICA. It is reported on Schedule SE of Form 1040 and is computed in three steps.

The 92.35% factor is what makes the actual rate lower than the 15.3% sticker. The IRS allows you to deduct the equivalent of the employer's share of FICA before applying the tax, because a W-2 worker would not pay income tax on the employer's hidden FICA contribution either. The arithmetic: 92.35% × 15.3% = roughly 14.13%. So the effective rate of SE tax on every dollar of net SE earnings — before any income tax — is approximately 14.13%, not 15.3%.^[5]

The Social Security cap

The 12.4% Social Security portion only applies to covered earnings up to the annual wage base. For 2026 the SSA set the wage base at $184,500,^[6] up from $176,100 in 2025 — the largest single-year increase since 2023. Once your covered earnings cross that threshold, the 12.4% SS portion stops; the 2.9% Medicare portion continues on every additional dollar without limit.

If you also held a W-2 job during the year, the SS wage base applies to your combined SS-covered wages plus SE earnings. The SSA's 92.35% factor is applied after netting the W-2 SS wages already taxed. Schedule SE Part I, Line 8 walks through this — you start with the wage base, subtract your W-2 SS wages already taxed there, and only the remainder is subject to the 12.4% SE-tax portion. This matters every year for new freelancers who quit a W-2 job mid-year and would otherwise overpay SS tax.

The Additional Medicare Tax

Above the Medicare 2.9% sits the 0.9% Additional Medicare Tax, enacted by the Affordable Care Act and unchanged since. It applies to combined earned income above $200,000 single, $250,000 married filing jointly, or $125,000 married filing separately.^[7] For self-employed taxpayers the Additional Medicare Tax is computed and paid on Form 8959 at filing time — there is no quarterly mechanism for it, although estimated payments should still include it to avoid underpayment.

Half of SE tax is deductible

The IRS allows you to deduct half of the SE tax on Schedule 1, Line 15 — an above-the-line deduction that reduces your Adjusted Gross Income (AGI). It mirrors the income-tax treatment of the employer's share of FICA for W-2 workers. The deduction reduces income tax owed but does not reduce the SE tax itself.

^* Above the $184,500 wage base only the 2.9% Medicare portion applies (plus 0.9% Additional Medicare above the personal threshold). Single high earners owe additional Form 8959 tax not included here.

Quarterly estimated taxes

The IRS expects tax to be paid as income is earned. W-2 workers satisfy this through withholding. Self-employed workers satisfy it through four estimated-tax payments per year, using Form 1040-ES. The 2026 calendar is below.

Note the uneven quarters — Q2 covers only two months, Q4 covers four. The IRS treats the cumulative-cumulative test as the binding one at filing time. The January 15 payment can be skipped if you file your 2026 return and pay any balance due by February 1, 2027.^[8]

The safe harbor rule

You avoid an underpayment penalty if you pay any of the following during the year:

• 90% of your current year's total tax — useful if you can forecast accurately.
• 100% of your prior year's total tax — useful for almost everyone. Requires looking up Form 1040, Line 24 from last year.
• 110% of your prior year's total tax if your prior-year AGI exceeded $150,000 ($75,000 if MFS). Most people who switched from W-2 to 1099 mid-career hit this threshold.

Take the smallest of the qualifying numbers, divide by four, and pay that amount each quarter. The prior-year safe harbor is the freelancer's friend because it removes the requirement to forecast a volatile income year. If your 2025 total tax was $24,000 and 2025 AGI was under $150K, four equal payments of $6,000 in 2026 prevents any penalty — even if you triple your income.

The underpayment penalty

If you miss the safe harbor, the IRS charges interest at the federal short-term rate plus 3 percentage points, calculated quarter by quarter and compounded daily. For Q1 2026 the rate was 7%; for Q2 2026 it is 6%.^[9] The penalty is computed on Form 2210 and is not deductible. On a $5,000 underpayment held for six months, the penalty runs roughly $150 — small enough that some freelancers treat it as a working-capital cost, but large enough that it is almost always cheaper to pay on time.

The QBI deduction in 2026 — and what the OBBBA changed

The Qualified Business Income (QBI) deduction under IRC §199A is the single largest benefit available to pass-through business owners and self-employed taxpayers. It lets you deduct up to 20% of your QBI from your taxable income — without affecting AGI, without requiring you to itemize, and without being limited by the standard deduction.

QBI is roughly your net profit from a U.S. trade or business, computed after Schedule C expenses but before the self-employment tax deduction. Wages paid to you (as a W-2 employee of someone else) do not count. Capital gains, dividends, and interest do not count. The deduction is taken on Form 8995 (simplified) or Form 8995-A (full).

The 2026 thresholds

The 20% deduction is straightforward until your taxable income crosses a phase-in threshold, at which point the rules tighten — particularly for "specified service trades or businesses" (SSTBs), which include consulting, law, accounting, financial services, health, performing arts, and "any business where the principal asset is the reputation or skill of one or more of its employees."^[10] For TY2026 the phase-in starts at:

• Single / HoH / MFS: $201,750 taxable income
• Married Filing Jointly: $403,500 taxable income

Below those thresholds the full 20% deduction applies regardless of business type, with no wage/property limitations. Above the threshold, SSTB owners begin to lose the deduction proportionally over a phase-out range; non-SSTB owners face wage-and-qualified-property limitations rather than outright elimination.

What the OBBBA changed for 2026

The One Big Beautiful Bill Act, signed in 2025, made three changes effective for tax year 2026:^[2]

1. The 20% QBI deduction is now permanent, removing the December 31, 2025 sunset that had been in the original 2017 Tax Cuts and Jobs Act. Self-employed taxpayers can plan multi-year retirement, business-structure, and equipment-purchase decisions without the prior expiration risk.
2. The phase-in range expanded from $50,000 / $100,000 (single / MFJ) to $75,000 / $150,000. This means SSTB owners with taxable income above the threshold now have a wider range over which the deduction phases out gradually rather than dropping off a cliff. A consultant at single taxable income of $250,000 in 2026 retains a larger fraction of the QBI deduction than the same consultant would have under the pre-OBBBA rules.
3. A new $400 minimum deduction floor applies starting in 2026 for any taxpayer with at least $1,000 of QBI from an active qualified trade or business. Side-gig 1099 income that previously produced a trivial QBI deduction now produces at least $400 — a small but useful structural improvement for part-time freelancers.

Schedule C: what actually deducts

Schedule C is where the 1099 freelancer's net taxable income is computed. The form has forty lines, but the structure is simple: gross receipts at the top, "ordinary and necessary" business expenses^[11] in the middle, and net profit (or loss) at the bottom. That net profit flows to two places: Schedule SE for SE tax, and Form 1040 for income tax. Schedule C deductions reduce both taxes — which is why expense tracking is the highest-ROI activity in self-employed tax planning.

The home office deduction, decoded

The home office deduction is the most-feared and least-understood Schedule C item. The rule is straightforward: a space used regularly and exclusively as your principal place of business qualifies.^[14] Two methods are available.

Simplified method: $5 per square foot of qualifying home office space, capped at 300 square feet. Maximum deduction: $1,500. No depreciation, no Form 8829, no recapture issue when you sell the home. The simplest possible compliance path and the right choice for most home offices under 200 sq ft.

Regular method: compute your home's actual operating expenses (utilities, insurance, maintenance, property tax, depreciation on the home), then multiply by the percentage of the home used for business (square footage of the office ÷ square footage of the home). A 300-square-foot office in a 2,400-square-foot home using $14,000 of annual operating expenses produces a $1,750 home office deduction (300/2,400 × $14,000 = $1,750). The regular method usually wins for offices ≥200 sq ft in higher-cost homes. The drawback: depreciation taken under the regular method is subject to recapture when you sell the home.

Vehicle expenses

If you drive for business — client meetings, delivery, on-site work — track mileage from January 1 to December 31. The standard mileage rate for 2026 is 70 cents per business mile,^[12] up from 67¢ in 2025. The standard rate covers gas, insurance, depreciation, and maintenance bundled. The alternative is the actual-expense method (track every receipt, pro-rate by business-use percentage), which usually wins only for high-cost vehicles driven heavily for business. Most self-employed taxpayers use the standard rate because it requires only a mileage log, not a shoebox of receipts.

Above-the-line deductions you keep regardless of bracket

"Above the line" means the deduction is subtracted from gross income to compute AGI, which then determines your taxable income, your bracket, your eligibility for credits, and your QBI deduction. Above-the-line deductions outperform itemized deductions because they help you regardless of whether you take the standard deduction. The four most important for self-employed taxpayers are below.

The compounding effect of stacking all four for a 1099 contractor at $120,000 net earnings is dramatic. Half-SE tax is roughly $8,478. Self-employed health insurance for a family of three averages ~$22,000/year.^[16] A Solo 401(k) employer contribution at the 25%-of-net cap is roughly $22,300. A family HSA at the 2026 cap is $8,750. Stacking those: $61,528 in above-the-line deductions, reducing AGI from $120,000 to $58,472 — and the income tax base shrinks accordingly before the 20% QBI deduction even kicks in.

SEP-IRA vs Solo 401(k): the contribution-limit math

The single biggest leverage the U.S. tax code gives self-employed people is access to dramatically higher retirement contribution limits than W-2 workers. A W-2 employee is capped at $24,500 of 401(k) deferral in 2026 (plus $7,500 age-50 catch-up, plus the SECURE 2.0 §109 enhanced $11,250 catch-up at ages 60-63).^[4] A self-employed person can contribute that same $24,500 as the "employee" side and add a second "employer" contribution up to 25% of net SE earnings — for a combined §415(c) limit of $70,000 in 2026 (or $77,500/$81,250 with the catch-ups).

The SEP-IRA: simplicity

A SEP-IRA (Simplified Employee Pension) is the easiest self-employed retirement plan to open. Most major brokerages set one up online in 15 minutes with no setup fee and no ongoing administration. The contribution limit is the lesser of:

• 25% of net SE earnings (after the half-SE-tax deduction); for sole proprietors, this works out to roughly 20% of net Schedule C profit because the calculation circularly reduces itself.^[17]
• The §415(c) limit of $70,000 (2026).

There is no employee deferral — the SEP is funded entirely by the "employer." That means a $60,000 net Schedule C profit produces a SEP contribution of roughly $11,150 (20% × $60,000 minus the SE-tax adjustment). The SEP is the right plan when the contribution math is the dominant criterion and you value administrative simplicity over maximum dollar shelter.

The Solo 401(k): higher ceiling

A Solo 401(k) (also called Individual 401(k)) has two contribution buckets, which together produce a much higher cap at moderate income levels:

• Employee deferral: up to $24,500 (2026), regardless of business income, as long as net SE earnings ≥ $24,500. Catch-up of $7,500 if age 50+; or $11,250 SECURE 2.0 enhanced catch-up at ages 60-63.
• Employer profit-sharing contribution: same 25%-of-net-SE-earnings calculation as the SEP, on top of the employee deferral.

A 1099 contractor with $60,000 of net SE earnings can put $24,500 (employee) + ~$11,150 (employer) = ~$35,650 into a Solo 401(k) — more than three times what the same income produces in a SEP. The Solo 401(k) also allows a Roth bucket (post-tax employee deferrals), which a SEP does not. The catch is administrative: a Solo 401(k) requires a written plan document and, once the plan's assets exceed $250,000, an annual Form 5500-EZ filing. Most major brokerages offer document services for free.

Approximate; actual deductions depend on the exact half-SE-tax adjustment. The §415(c) limit binds the total at $70,000 (or $77,500/$81,250 with catch-ups) regardless of earnings.

Health insurance, HSAs, and the self-employed

The self-employed health insurance deduction (SHID) lets you deduct 100% of premiums paid for health, dental, vision, and qualified long-term care coverage for yourself, your spouse, and your dependents — taken above-the-line on Schedule 1, Line 17.^[18] It is one of the most valuable structural advantages of self-employment: a W-2 worker generally can only deduct medical expenses that exceed 7.5% of AGI on Schedule A, and only if they itemize. A self-employed person deducts 100% of premiums from dollar one without itemizing.

Three constraints to know. First, the deduction is limited to your net SE earnings minus the half-SE-tax deduction — a business operating at a loss cannot create a negative-income deduction. Second, you cannot deduct premiums for months you were eligible for employer-subsidized coverage through your own employment or your spouse's. Third, only the portion of premiums paid by you (not advance premium tax credits or other subsidies) is deductible.

The HSA stack for the self-employed

If your health plan is a qualifying High Deductible Health Plan (HDHP) — deductible ≥$1,650 self-only / $3,300 family for 2026, out-of-pocket max ≤$8,500/$17,000 — you can also fund a Health Savings Account.^[15] 2026 contribution limits are $4,400 self-only and $8,750 family, plus a $1,000 catch-up at age 55+. The self-employed HSA contribution is deductible on Schedule 1, Line 13 (not on Schedule C, because the HSA owner is the individual, not the business).

HSAs are the only account in the U.S. tax code with a triple tax benefit: contributions are deductible going in, growth is tax-free, and qualified medical withdrawals are tax-free coming out. For a self-employed taxpayer in the 22% federal bracket plus 5% state tax, every $1,000 of HSA contribution saves $270 of tax today — and, if the HSA is invested rather than spent on current medical bills, the underlying balance grows tax-free until age 65 when it converts into an effective traditional-IRA-equivalent for any purpose.

Three case studies with the full arithmetic

The numbers below were derived from Schedule C / Schedule SE / Form 1040 walk-throughs using the TY2026 brackets,^[3] the 2026 SS wage base,^[6] and the OBBBA §199A thresholds.^[2]

Case 1 — Maya, $60,000 freelance designer, no spouse, no kids, Florida

Maya quit her W-2 design job in January 2026 and now invoices clients on her own. Gross 1099-NEC receipts: $68,000. Schedule C expenses: $5,000 software/subscriptions, $1,500 simplified-method home office, $1,500 business mileage (~2,140 miles × 70¢). Net Schedule C profit: $60,000.

• SE tax: $60,000 × 92.35% × 15.3% = $8,478. Half-SE-tax deduction: $4,239.
• Solo 401(k) employer contribution: Maya opens a Solo 401(k) at Fidelity. Employee deferral $24,500; employer contribution ~$11,150. Total: $35,650. AGI reduction.
• Self-employed health insurance: $7,200 silver-plan premium for the year (no APTC subsidy because her income made her ineligible). AGI reduction.
• HSA: HDHP plan; $4,400 self-only contribution. AGI reduction.
• AGI: $60,000 − $4,239 − $35,650 − $7,200 − $4,400 = $8,511.
• Standard deduction: $16,100 single (2026) → taxable income before QBI = $0 (deduction exceeds AGI).
• QBI deduction: minimum $400 floor under OBBBA because she has ≥$1,000 of active QBI.
• Federal income tax: $0.
• Florida state income tax: $0 (no state tax).
• Total 2026 federal tax: $8,478 SE tax + $0 income tax = $8,478.

Maya's effective federal tax rate on $60,000 of net earnings is 14.13% — the SE tax rate alone. She sheltered enough income through retirement and health benefits to wipe out federal income tax entirely. A W-2 worker earning $60,000 in Florida would owe roughly $4,590 of FICA (the employee half) and roughly $4,800 of federal income tax — about $9,390 combined, $912 more than Maya, despite never having to deal with quarterly payments or Schedule C.

Case 2 — Daniel, $120,000 first-year consultant, MFJ, Illinois, two kids

Daniel left a W-2 consulting job in February 2026 with $25,000 of W-2 income already taxed. He invoiced $108,000 from June through December on 1099-NEC. Schedule C expenses: $4,000 software, $1,500 home office, $2,800 mileage (4,000 miles × 70¢). Net Schedule C profit: $99,700. Plus W-2: total household earned income $124,700.

• SE tax: First, Schedule SE Part I, Line 8 applies the W-2 SS wages already taxed. His W-2 had ~$25,000 of SS wages, leaving $159,500 of the $184,500 cap remaining. His net SE earnings × 92.35% = $92,073, which is entirely under the remaining cap. So full 12.4% + 2.9% applies. SE tax: $99,700 × 92.35% × 15.3% = $14,089. Half-SE-tax deduction: $7,045.
• Solo 401(k): He opens one in November. Employee deferral $24,500; employer contribution ~$18,500. Total: $43,000.
• Wife's W-2 retirement: separately funded; not affecting Schedule C math.
• Self-employed health insurance: $19,200 family premium for July-December. AGI reduction.
• Family HSA: HDHP plan; $8,750 contribution. AGI reduction.
• QBI deduction: $99,700 net Schedule C → 20% = $19,940. Below the MFJ phase-in ($403,500), so the full deduction applies even though consulting is an SSTB.
• Combined gross income: $25,000 W-2 + $99,700 Schedule C + $50,000 spouse W-2 = $174,700.
• AGI: $174,700 − $7,045 − $43,000 − $19,200 − $8,750 = $96,705.
• Standard deduction MFJ: $32,200. Taxable income before QBI: $64,505. QBI deduction: $19,940 (but capped at 20% of taxable income minus net cap gains = $64,505 × 20% = $12,901). Effective QBI deduction: $12,901.
• Taxable income: $51,604. Falls in MFJ 12% bracket. Federal income tax: ~$2,300 (after Child Tax Credit of $4,000 for two kids, refunded portion of CTC applies).
• Illinois state income tax: 4.95% flat × $96,705 = ~$4,787 (Illinois uses federal AGI minus exemptions as the base; simplified here).
• Estimated payments required: Safe harbor: 100% of 2025 tax (his prior W-2 year). If 2025 total tax was ~$22,000, he needed to pay ~$5,500 per quarter to be safe — but the Q1 and Q2 deadlines came before he had clear visibility into his Schedule C income. The clean path: pay 100% of 2025 tax in four equal quarterly installments and reconcile in April 2027.

Daniel's lesson: the first-year freelancer who follows the prior-year safe harbor avoids underpayment penalty even if his current-year tax explodes upward, because the safe harbor is locked to last year's filed return.

Case 3 — Elena, $300,000 LLC consultant (SSTB), single, California

Elena is a self-employed management consultant — a specified service trade or business under §199A. Her single-member LLC books $315,000 of gross receipts in 2026. Schedule C expenses: $15,000 (software, subcontracted research, professional dues, travel). Net Schedule C profit: $300,000.

• SE tax: SS portion caps at $184,500 wage base × 12.4% = $22,878. Medicare 2.9% on full $300,000 × 92.35% = $8,034. Additional Medicare 0.9% on amount above $200,000 single threshold (computed on Form 8959). SE tax (excluding Additional Medicare on Form 8959): ~$30,912. Half-SE-tax deduction: $15,456.
• Solo 401(k): Maxes out at §415(c) cap of $70,000.
• Self-employed health insurance: $11,400 silver plan (single, age 38). AGI reduction.
• HSA: not eligible (her chosen plan is not HDHP).
• AGI: $300,000 − $15,456 − $70,000 − $11,400 = $203,144.
• Standard deduction: $16,100 single. Taxable income before QBI: $187,044.
• QBI deduction (SSTB phase-in): Elena's taxable income $187,044 is just under the $201,750 single threshold for TY2026. She receives the full 20% QBI deduction. 20% × QBI ($300,000 − half-SE-tax $15,456 − SEP/Solo 401(k) employer $45,500 − SE health insurance $11,400) = 20% × $227,644 = $45,529. Limited to 20% of (taxable income before QBI − net cap gains): 20% × $187,044 = $37,409. Effective QBI deduction: $37,409.
• Final taxable income: $187,044 − $37,409 = $149,635. Federal income tax (single 2026 brackets): ~$28,300.
• Additional Medicare on Form 8959: 0.9% × ($300,000 × 92.35% − $200,000) = 0.9% × $77,050 = $694.
• California state tax: ~9.3% effective on her California-source AGI ≈ $18,000.
• Total 2026 tax: $30,912 SE + $694 Add'l Medicare + $28,300 federal income + $18,000 CA = ~$77,906.

Elena's takeaway: by maxing her Solo 401(k) and stacking the SE health insurance deduction, she kept her taxable income $14,706 below the SSTB phase-in threshold and preserved the full 20% QBI deduction. The QBI deduction alone saved her roughly $11,000 in federal tax (32% marginal bracket × $37,409 deduction × ~0.92 net of stacking effects). If she had earned $30,000 more — pushing her past the $201,750 phase-in — she would have phased out a meaningful portion of that deduction. The structural lesson for SSTB consultants in 2026 is that the taxable-income ceiling matters far more than the gross-revenue figure.

Six mistakes the IRS reliably catches

1. Treating a hobby as a business. The IRS distinguishes a trade or business (profit motive, regular activity) from a hobby (occasional, personal interest). Hobby income is taxable but hobby losses are not deductible — and the IRS uses the "three of the last five years" profit test as a starting screen.^[19] Document profit motive: business plan, separate bank account, time invested, marketing, and prior profitable years.
2. Mixing personal and business expenses. Open a dedicated business checking account and credit card on day one. Pay every business expense from those accounts. Reimburse yourself from business funds for personal-card business charges within the month. The IRS's first audit ask is bank statements; clean separation makes the audit short.
3. Skipping the 1099-NEC issuance to your own subcontractors. If you paid any contractor $600 or more for services in the calendar year, you owe them a 1099-NEC by January 31, 2027 and the IRS its Copy A.^[20] Penalty for non-filing: $60-$330 per form depending on lateness. Use a payroll service (Gusto, Wave, QuickBooks) or the IRS IRIS portal directly.
4. Forgetting to pay state quarterly estimates. Federal Form 1040-ES is well known. Most states require their own quarterly estimated payments with separate forms (CA Form 540-ES, NY IT-2105, IL IL-1040-ES, etc.). State underpayment penalties accumulate independently of federal.
5. Claiming the home office and the regular office. "Principal place of business" excludes spaces where you also have a separate dedicated commercial office. If you rent coworking space three days a week, your home office likely fails the "regular and exclusive" test.
6. Misclassifying yourself as a 1099 contractor when you should be a W-2 employee. If you work for one company, on their schedule, with their equipment, under their direction, the IRS and Department of Labor consider you a W-2 employee — regardless of what your contract says.^[21] The misclassification exposes you to back FICA tax and your client to penalties. The IRS Form SS-8 lets either party request a formal determination.

Eight-item self-employed-tax checklist

Run this every January 1 (year start) and again every December 31 (year end):

1. Confirm prior-year total tax (Form 1040 Line 24) and compute the four equal quarterly safe-harbor payments for the current year. Calendar them: April 15, June 15, September 15, January 15.
2. Open or confirm a dedicated business checking account and business credit card. Move every business expense onto them.
3. Choose a retirement plan (Solo 401(k) for most freelancers earning ≥$30K; SEP-IRA if you value simplicity over maximum dollar shelter). Open before December 31 to count for the current year.
4. Verify HDHP eligibility and fund the HSA at the family or self-only 2026 limits via Schedule 1, Line 13.
5. Track every business mile in a dedicated app (MileIQ, Driversnote, or a manual spreadsheet). 2,000+ business miles per year is the threshold where mileage logging clearly pays for itself.
6. Run any contractor you paid $600+ this year through a 1099-NEC by January 31 of the following year. Use IRS IRIS or a payroll service.
7. Project your QBI deduction in November. If you are an SSTB approaching the $201,750 single / $403,500 MFJ phase-in threshold, increase Solo 401(k) employer contribution to push taxable income below the threshold before December 31.
8. Reconcile the December bank statement to your Schedule C profit-and-loss before filing. Receipts kept three years (six years if you under-reported by ≥25%); permanently for fixed-asset purchases.

Frequently asked questions