The Freelancer Tax Season Checklist: What to Do From Now Until April 15

Now through September 15

The single most useful thing you can do in August and early September has nothing to do with taxes. It is getting your books current, while you can still remember what a $340 charge in March was for.

Work through the year so far in three passes. First, list every invoice you sent, with date and amount. Second, list every deposit that hit your business account. Third, match them. The gaps in that match are the entire point of the exercise: a deposit with no invoice behind it is usually income you forgot to record, and an invoice with no deposit behind it is either a payment you never chased or a client who is quietly not going to pay you.

That second category is why September matters. Chasing an invoice from March is awkward in September and nearly hopeless in February, when the client contact has changed jobs and the project is a year stale. Clients answer email in September. If you have an invoice that has aged past its terms, send the escalation now — our guide to writing a demand letter for an unpaid invoice covers the structure that actually gets paid, and the four lines that turn a demand letter into evidence against you.

There is also a tax reason to resolve this before year end. If you use the cash method — which most freelancers do — you report income when you receive it, so an invoice that is never paid was never income and does not need a bad-debt deduction. But a client who pays you in the last week of December has handed you 2026 income, and one who pays on January 3 has handed you 2027 income. Late in the year, the timing of your collections is a lever you can actually pull.

Then make the Q3 payment. September 15, 2026 covers earnings from June through August. If your income this year is meaningfully different from last year, this is the moment to recalculate rather than repeat last quarter's number out of habit. The mechanics — safe harbor percentages, how to compute the payment, and what happens if you skip one — are in our guide to quarterly estimated taxes for freelancers.

October through December

This is the only stretch of the calendar where you can still change your tax bill. After December 31 you are a historian; until then you are a participant. Three things belong on the fall list.

W-9s, in both directions. If you have subcontracted any work this year — a designer, an editor, a virtual assistant — you need a completed Form W-9 from each of them before you try to issue 1099s in January. Collecting a W-9 from someone you paid in April and have not spoken to since is a genuinely unpleasant January task. Going the other way, make sure every client who will need to file a 1099 for you already has your current W-9 on file, with the right entity name and taxpayer identification number. See our guide to the W-9 for freelancers for what goes in each box.

Deductions that require action before December 31. Equipment has to be placed in service — actually available for use in your business, not merely ordered — by December 31 to be deductible for 2026. A laptop that ships on January 2 is a 2027 deduction no matter when you paid for it. Retirement contributions are the useful exception to the year-end rule: SEP-IRA and Solo 401(k) contributions can generally be made up to the filing deadline, and for a SEP that includes extensions, though a Solo 401(k) normally has to be established by year end even if it is funded later. Self-employed health insurance premiums are an above-the-line deduction, which means you get them whether or not you itemize.

Home office documentation. The requirement is regular and exclusive business use of the space — the dining table you also eat at does not qualify, and the IRS is not subtle about this. If you qualify, measure the space now and write the number down. The simplified method is $5 per square foot up to 300 square feet, capping the deduction at $1,500, and it spares you from allocating utilities, insurance and depreciation. The regular method can be worth considerably more if your space is large or your rent is high, but only if you kept the underlying bills.

And a note on the biggest line item most freelancers never think about: the qualified business income deduction under Section 199A, worth up to 20% of qualified business income, is now permanent under the One Big Beautiful Bill Act. It is not something you elect in December — it falls out of your return — but it is a reason to make sure your net profit is computed correctly rather than approximated.

Every deduction above lives or dies on documentation. The pattern to internalize is that the deduction is not the receipt, it is the record that connects the expense to the business.

January

January opens with a payment and closes with a mailbox. January 15, 2027 is the fourth estimated payment for tax year 2026, covering September through December. It is the last chance to reduce an underpayment penalty on 2026 income, and it is the payment freelancers most often skip — partly because it arrives in the middle of the holiday hangover, partly because December income is hard to pin down before the year has closed.

Then the forms start arriving. Recipient copies of Form 1099-NEC for 2026 payments are due February 1, 2027, because the usual January 31 deadline falls on a Sunday. Most arrive in the last ten days of January; platform-issued 1099-K forms tend to land later.

The pile will be smaller this year, and that is expected. For payments made in 2026 the 1099-NEC and 1099-MISC threshold rose from $600 to $2,000, so every client who paid you less than $2,000 across the year correctly sends nothing. The 1099-K threshold is separate and requires both more than $20,000 in gross payments and more than 200 transactions, which excludes most individual freelancers entirely. Our breakdown of the 2026 threshold changes has the details. None of it reduces your taxable income by a cent — it just means the IRS receives fewer third-party reports and your books carry more of the weight.

Which is why January is the right month to build a reconciliation sheet. One row per client, four columns:

• Client — the payer name exactly as it will appear on the form, which is often not the brand name you know them by.
• Total invoiced and received in 2026 — from your own records, on the cash basis you actually report on.
• 1099 received? — yes or no, with the form type. A missing form against a total under $2,000 is normal. A missing form against $18,000 is a question for the client.
• Amounts match? — yes, or the size and direction of the difference.

The sum of column two is your gross receipts on Schedule C. The 1099 column is a cross-check, not the source. Freelancers who work the other way around — adding up the forms and calling that revenue — systematically under-report, and under the new threshold they will under-report by more than they used to.

February and March

By the second week of February your reconciliation sheet is close to complete, and the mismatches are the work.

A 1099 that is wrong. Ask the payer for a corrected form. Most will issue one once you show them the discrepancy, and the corrected copy goes to the IRS as well, which is the part that matters. If the payer stalls or refuses and the form overstates your income, report the correct amount from your own records and keep the invoices, bank statements and your email chain with the payer. The IRS matches returns against information returns, and a difference you can document is a manageable letter rather than a problem. The three usual causes: gross platform payments reported before fees were deducted, a check dated December 28 that you did not receive until January, and reimbursed expenses folded into the compensation box.

The 1099-K double-count trap. This is the mismatch that costs real money. If a client paid you through a platform that issues a 1099-K, and that same client also filed a 1099-NEC for the same payments, the identical income has now been reported to the IRS twice. You owe tax on it once. Do not quietly report the higher total to keep the matching clean — identify which form covers which payments, report your actual income, and ask the client to correct the duplicate 1099-NEC. Payments made through a card or third-party network should generally be reported by the platform, not by the client, but plenty of clients file anyway out of caution.

Assemble Schedule C. With income settled, sort your expenses into the categories the form actually uses — advertising, car and truck, contract labor, insurance, legal and professional services, office expense, rent, supplies, travel, meals, utilities, and other. Doing this in February rather than April is the difference between a tidy return and an afternoon of guessing. Meals remain the category most likely to be examined, so note who you ate with and why.

Book the CPA now. Good accountants stop accepting new individual clients somewhere in early to mid March. If your year included anything unusual — an entity change, a state you did not live in before, equity from a client, meaningful foreign income — you want a professional, and you want them before their calendar closes. Arrive with the reconciliation sheet and the categorized expenses and you will pay for less of their time.

April

April 15, 2027 is the filing deadline for 2026 individual returns. It is also, and this is the trap, the due date for the first estimated payment of tax year 2027. Two payments, one date: whatever you still owe on 2026, plus roughly a quarter of what you expect to owe on 2027. Freelancers who budget for one of those and not the other have an unpleasant morning.

If you need more time, file Form 4868 — but understand what it buys. An extension moves your filing deadline to October 15, 2027. It does not move the payment deadline by a single day. The IRS is explicit: the extension is only for filing, and you must pay what you owe by the April date. So the correct sequence is to estimate your liability as well as you can, pay that estimate on April 15, and then use the extra six months to assemble a return you are not rushing. An extension filed with no payment attached simply starts the interest clock with extra steps.

If you cannot pay in full, file anyway. This is the most expensive misunderstanding in self-employed taxes. The failure-to-file penalty is 5% of the tax due for each month or partial month the return is late, up to 25%. The failure-to-pay penalty is 0.5% per month. Filing on time and paying late costs you a tenth as much per month as the reverse, and the IRS offers payment plans you can apply for online. Pay whatever you can by April 15 to shrink the balance that penalties and interest are computed on, file the return, and set up the plan.

Then close the loop for next year. Before the file is cold, write down what made this year harder than it needed to be — the client whose payer name you could not match, the expense category you had to reconstruct, the quarter you underpaid. Set the 2027 estimated payment dates in your calendar. Start the reconciliation sheet for 2027 in April, with one row already filled in.

The short version

Pay on September 15 and January 15. Spend the fall getting your books current, collecting W-9s and documenting deductions while the year is still changeable. Build a client-by-client reconciliation sheet in January and treat the 1099s as a cross-check against it, not as your bookkeeping — there will be fewer of them this year and their absence proves nothing. Fix wrong forms in February, hire your accountant in early March, and remember that April 15 is two payments, not one.

This article is general information about how US federal tax rules commonly apply, not tax or legal advice, and reading it does not create a professional relationship. Tax rules differ by situation and change over time. Confirm current figures with IRS.gov and consult a CPA or licensed tax professional about your specific circumstances.