The Complete Tax Document Checklist for 2026 Filers

Almost every delayed return comes down to one missing document. This checklist covers what a 2026 filer needs, by situation. Extended 2025 individual returns are due October 15, 2026; 2026 returns are due April 15, 2027.

Personal and identity information

• Social Security numbers or ITINs for you, your spouse and every dependent — one wrong digit rejects the return.
• Legal names and birth dates exactly as printed on Social Security cards, plus a photo ID for both spouses — several states require its number and dates.
• Identity Protection PIN — six digits, reissued by the IRS every year. Last year's will not work.
• Bank routing and account numbers for a refund or balance-due withdrawal.
• Life changes: marriage, divorce, a birth, a death, a move between states. Filing status moves the tax more than almost anything.
• Form 8332 if a non-custodial parent is claiming a child.

Income if you are an employee

• Form W-2 from every employer, including two-week jobs; furnished by February 1, 2027 for 2026.
• Records of qualified tips and qualified overtime. For 2025 through 2028 the deductions reach $25,000 for tips and $12,500 for overtime ($25,000 joint), phasing out from $150,000 of modified AGI ($300,000 on a joint return).
• Form 1099-G for unemployment compensation, which is federally taxable.
• Form W-2G for gambling winnings, plus your record of losses.

Self-employed and gig income

• Form 1099-NEC from each client paying $2,000 or more — the One Big Beautiful Bill Act raised the old $600 reporting threshold for payments made after 31 December 2025, so fewer clients will send you one; the income is taxable either way, and Form 1099-MISC for rents, prizes and settlements.
• Form 1099-K from payment apps and marketplaces — see below.
• Your own gross receipts total, cash included — income is taxable whether or not a form reports it.
• Expenses summed by category, backed by invoices — not 300 loose images.
• A mileage log with dates, destinations and purpose, totalled either side of July 1.
• Home office figures: office and total square footage, rent or mortgage interest, utilities.
• Estimated payments with dates — Q3 2026 is due September 15, 2026 and Q4 is due January 15, 2027.

The 1099-K threshold went back up. For 2025 and 2026 a platform must issue Form 1099-K only if gross payments exceeded $20,000 and transactions exceeded 200. Both tests. Sell $26,000 across 140 transactions and no form is required — yet all $26,000 is still reportable.

Mileage has two 2026 rates. Business was 72.5 cents through June, 76.0 cents from July 1. Drive 4,200 business miles in the first half and 3,600 in the second: 4,200 × $0.725 = $3,045 plus 3,600 × $0.760 = $2,736, or $5,781. The 2025 rate was a flat 70.0 cents.

Investments and digital assets

• The consolidated Form 1099 from each brokerage — 1099-B, 1099-DIV, 1099-INT, sometimes 1099-OID. Wait for corrections, common in February and March.
• Cost basis the broker did not report — older lots and transferred-in shares.
• Form 1099-DA for digital assets. Brokers report gross proceeds from January 1, 2025 and basis on certain transactions from January 1, 2026, so 2025 sales usually need your own basis.
• A full CSV history from every exchange and wallet, plus staking, mining, airdrops and crypto taken as payment.
• Foreign accounts over $10,000 combined at any point — an FBAR (FinCEN Form 114) is due, extended to October 15, 2026 for 2025.

Retirement and Social Security

• Form 1099-R for distributions, rollovers and Roth conversions.
• Form SSA-1099 for Social Security benefits.
• Form 5498 for IRA contributions — it arrives in May, so tell us the amounts.
• Every Form 8606 you have filed. It tracks non-deductible IRA basis; losing it means paying tax twice.
• Your 2026 contribution totals. Limits: $24,500 for a 401(k), 403(b), 457 or TSP plus $8,000 at 50 or older ($11,250 at 60 to 63); $7,500 for an IRA plus $1,100 at 50 or older.
• Your age, if 65 or older. For 2025 through 2028 there is an extra $6,000 deduction each ($12,000 if both spouses qualify), phasing out from $75,000 of modified AGI ($150,000 on a joint return).

Rental property

• Rent received per property, plus any 1099-MISC or 1099-K from a manager or platform.
• Form 1098 for each mortgage, with property tax and insurance bills.
• Invoices, not totals — repairs are deducted now, improvements are depreciated.
• The prior depreciation schedule and closing statements for any purchase, sale or refinance.
• Days rented at fair value versus days of personal use.

K-1s from partnerships, S-corps and trusts

• Schedule K-1 (Form 1065) from each partnership or multi-member LLC.
• Schedule K-1 (Form 1120-S) from each S-corporation.
• Schedule K-1 (Form 1041) from each trust or estate.
• Schedule K-3 where the entity has foreign activity.
• Basis, at-risk and passive loss worksheets — the K-1 does not carry them, and losses get disallowed without them.

A late K-1 is the commonest reason a personal return sits unfinished. Extended 2025 partnership and S-corp returns are due September 15, 2026; trusts and estates, September 30, 2026.

Education

• Form 1098-T and the bursar's account statement — the two often disagree.
• Form 1098-E for student loan interest paid.
• Receipts for books, supplies and required equipment the school never bills.
• Scholarship and grant letters — some scholarship money is taxable.
• Form 1099-Q for 529 distributions, and what they paid for.

Health insurance and HSAs

• Form 1095-A if anyone had marketplace coverage — mandatory, it reconciles your premium tax credit.
• Form 1099-SA and Form 5498-SA, with receipts showing qualified medical expenses.
• Your 2026 HSA numbers — the limit is $4,400 self-only and $8,750 family. If your employer put $1,200 into a family HSA, you may add $8,750 − $1,200 = $7,550.
• Out-of-pocket medical totals if you might itemise, plus medical mileage at 20.5 cents through June 2026, 23.5 cents after.

Homeownership

• Form 1098 for mortgage interest, points, mortgage insurance and escrowed property taxes.
• Property tax bills paid directly, and any value-based vehicle tax.
• The closing disclosure for a purchase, sale or refinance.
• Home improvement receipts — they raise basis and cut the gain on sale.
• Form 1099-S if you sold, with ownership and occupancy dates.
• Energy improvement invoices, for a 2025 return only — the home energy credits ended for property placed in service after December 31, 2025.

For 2026 the state and local tax deduction cap is $40,400 ($20,200 married filing separately). It phases down above $505,000 of modified AGI, but never below $10,000.

Charitable giving

• A contemporaneous written acknowledgment for every single gift of $250 or more. A cancelled check is not enough; the letter must state whether you got anything back, and its value.
• Bank or card records for cash gifts under $250.
• An itemised list for non-cash gifts — item, condition, charity receipt. Above $500, Form 8283 is required.
• A qualified appraisal above $5,000 for one item or a group of similar items.
• Charitable mileage at 14 cents, a rate fixed by statute.

Two 2026 changes make receipts worth keeping either way. Non-itemisers may deduct up to $1,000 of cash gifts ($2,000 joint). Itemisers deduct only what exceeds 0.5% of AGI: on $140,000 of AGI the floor is 0.005 × $140,000 = $700, so $3,000 of gifts yields $2,300.

Childcare and dependent care

• The provider's name, address and taxpayer ID — Form 2441 will not go through without it.
• Amount paid per child, per provider. Summer day camp counts; overnight camp does not.
• Dependent care FSA amounts from your W-2, which reduce eligible expenses.
• Support records for a dependent who is not your child.

State and local items

• Every state you lived or worked in, with dates — a move means two state returns.
• State estimated payments with dates, and Form 1099-G for a prior-year state refund.
• State-only items: 529 contributions, renter's credits, property tax relief, city returns.

We prepare federal returns for taxpayers anywhere in the United States, and state returns for every state except those listed here. A small number of states license or register tax return preparers, and we do not offer services there until our registration is in place. We cannot currently prepare any returns for residents of Connecticut and New York, where a state preparer registration is required before a firm may prepare returns or advertise. We cannot currently prepare individual income tax returns for residents of Maryland and Oregon; business and fiduciary returns for those states are outside that restriction. If you are in one of those states, get in touch and we will tell you exactly where our registration stands.

Prior-year documents we always want

• Last year's complete return — every schedule and statement, not the first two pages.
• Depreciation and amortisation schedules for every business asset and rental.
• Carryforwards: capital, net operating and passive losses, charitable carryovers, Form 8606 basis.
• Any IRS or state notice received.
• Estimated payment confirmations from IRS Direct Pay, EFTPS or a state portal.

If you are switching preparers

• Your two most recent filed returns — three if you own a business.
• The depreciation schedule — most often lost in a handover.
• Basis and carryforward worksheets for partnerships, S-corps and IRAs.
• Notice CP261 (S-corporation election acceptance) and Notice CP575 (EIN assignment).
• Current-year payroll filings: Forms 941, state unemployment returns, W-2s issued.
• Sales tax returns filed so far, plus a bookkeeping file backup.
• Anything still open: an unanswered notice, an amended return, an unpaid balance.

If a former preparer will not release records, IRS account and wage transcripts usually reconstruct what was filed and paid. We can retrieve those.

Business owners: the additional list

• Year-end profit and loss and balance sheet, from closed, reconciled books.
• Twelve months of bank and card statements for every business account.
• Loan statements: year-end principal and interest paid.
• Payroll reports: Form W-3, four Forms 941, state filings, W-2s issued.
• Forms 1099-NEC and 1099-MISC you issued, plus Forms W-9 collected. For 2026, 1099-NECs are due February 1, 2027; 1099-MISCs reporting box 8 or 10 are due to recipients by February 16, 2027. Ten or more must be e-filed.
• Asset additions and disposals with invoices. For 2026 the Section 179 limit is $2,560,000, phasing out from $4,090,000; 100% bonus depreciation is permanent for property acquired after January 19, 2025.
• Inventory counts at each year end, and vehicle records: total miles, business miles split at July 1, purchase documents.
• Entity documents: operating agreement, ownership percentages, any change in the year.
• Owner items: health insurance, retirement contributions, and for S-corp owners the wages run through payroll.

We prepare financial reports from the records you provide. We do not audit, review, or compile financial statements, and we express no opinion or any form of assurance on them.

Records to keep but not send us

• Individual receipts inside a category total — send totals, keep receipts.
• Personal bank statements, unless we ask.
• The mileage log itself — we need only the two totals.
• Monthly brokerage statements, once the consolidated 1099 arrives.
• Wills, trusts and insurance policies, unless a trust issues a K-1.

How long to keep each record

These track the IRS periods of limitations — the windows in which more tax can be assessed, or a refund claimed.

Digital copies are fine. We keep signed Forms 8879 — your e-file authorisation — for three years from the return due date or IRS received date, whichever is later.

Key takeaways

• Gather by situation — most filers need three or four of these sections.
• Never email anything showing a Social Security number — use the secure portal.
• The 1099-K threshold is back to over $20,000 and over 200 transactions, but unreported income is still income.
• 2026 has two business mileage rates — 72.5 cents through June 30, then 76.0 cents — so log miles in halves.
• Keep charity receipts even if you do not itemise — from 2026 non-itemisers get up to $1,000 ($2,000 joint), and itemisers face a 0.5%-of-AGI floor.
• Three years is the usual retention rule, six if income was underreported by over 25%, forever for the returns themselves.