Plan your US quarterly estimates
No employer withholding your tax? We project the year, size the four estimated payments to hit safe-harbor, and keep April from biting.
Bring in your income
Link your accounts so we can see your 1099 and any W-2 withholding, or just type your expected income for the year.
Step by step
The same journey, written out — so you can read it at your own pace.
- Bring in your income
Link your accounts so we can see your 1099 and any W-2 withholding, or just type your expected income for the year.
- Project the year
We estimate your federal income tax, self-employment tax and state liability on your projected income.
- Split to safe-harbor
We size four equal payments to meet the safe-harbor — usually 100% (or 110% for higher earners) of last year’s tax — so there’s no underpayment penalty.
- Schedule & track
Get a reminder before each due date with the exact figure and a link to IRS Direct Pay — and we track what you’ve paid.
Common questions
What is the safe-harbor?
Pay at least 90% of this year’s tax or 100% of last year’s (110% if your AGI was over $150k) in timely estimates and the IRS won’t charge an underpayment penalty — even if you owe more at filing.
Do I still file a return?
Yes — estimates are payments on account. You file your 1040 in April and the estimates are credited against the final bill.
Stop dreading April
Project your year, size your estimates to safe-harbor and get reminders before every deadline.
Start freeThis guide is general information, not personal tax advice, and reflects the rules we believe to apply as at June 2026 — rates and thresholds change. Always check your own figures against the IRS and consider a qualified adviser before acting. You remain responsible for the accuracy of anything you file.
Go deeper
The full guides and articles behind this journey.
Brackets and the standard deduction, marginal vs effective rates, FICA, retirement accounts, capital gains and the OBBBA changes.
The nine no-tax states, flat vs graduated rates, who actually gets to tax you, the remote-work convenience rule, and the SALT cap after the One Big Beautiful Bill.
The 15.3% SE-tax saving is real — but reasonable comp, QBI and state rules can shrink or wipe it out. Here's the math.
More flight plans
File your Self Assessment
From a blank return to filed-with-HMRC in one sitting — your figures pulled in, the maths checked, the SA100 submitted.
Build & file your company accounts
Turn a year of bank transactions into FRS 105 micro-entity accounts and file the iXBRL to Companies House — without a spreadsheet in sight.
File your Corporation Tax (CT600)
Carry your accounts into the CT600, let us handle marginal relief and the adjustments, and file the return plus computation to HMRC.