Freelancer quarterly tax checklist: what to gather, in what order

Quarter-end is not hard, it is just unorganized: income scattered across invoices and payments, expenses buried in a statement, and a deadline. The checklist is short when the records exist - and hellish when they do not.

The short answer

You need four numbers: income this quarter, expenses this quarter, the tax you set aside so far, and last quarter's payment for reference.
Income means paid and invoiced-separately - invoiced but unpaid is a list, not a number, and mixing them is the classic mistake.
Expenses go by category with a receipt story for anything unusual. Round numbers with no note are what audits are made of.
Estimate from the real numbers, not from hope: this quarter's actuals times your rate, adjusted for what changed.
The open questions list is part of the deliverable. An accountant who receives 'these three things are unclear' is working with you; one who discovers them in April is billing you.

The checklist, in order

List every payment received this quarter, by month: bank deposits, payment apps, everything. Match each to an invoice number where one exists.
List invoices sent but not yet paid, separately. They are next quarter's income, not this quarter's.
Total expenses by category from your statement, not from memory: software, hardware, travel, subcontractors, the home-office share.
Find the odd ones: anything round, anything cash, anything without a note. Give each a one-line story now while you remember.
Write the summary: income by month, expenses by category, totals, and the three open questions. Hand that to your accountant or your tax software.
Pay the estimate, then set next quarter's reminder for two weeks before the deadline, not on it.

What makes this painful, and the fix

Records kept in three places: the bank, the invoicing tool, the head. The fix is one ledger, updated as things happen, even roughly.
Categorizing everything in the last week. The fix is small weekly passes - ten minutes beats a lost weekend.
Guessing the estimate high or low by feel. The fix is computing it from the quarter's real numbers, every quarter, the same way.

The free tool for this

What an hour has to cost to pay you - What an hour has to cost to pay you. It runs in the page, asks for your own numbers, and sends nothing anywhere.

If you would rather not build it yourself

Money OS drafts the whole thing by conversation: /tax reads your ledgers (and your Freelance OS invoice ledger if you have one), produces income by month, expenses by category, and the open questions first. Not tax advice - a draft you hand over. Money OS is $34. See it on the shop, and there is a plain page about it here: what it holds.

Questions people actually ask

Is this tax advice?

No, and neither is any checklist on the internet. This organizes your numbers; your accountant or the tax authority's own rules decide what they mean.

What if my records are a mess right now?

Start from the statements: banks keep history, and a categorize-by-vendor pass reconstructs most of a quarter in an hour. Going forward, one ledger beats reconstruction.

The quarterly taxes checklist for a one-person business