Tax Planning
Estimated Taxes When Your Income Is Uneven
Four equal payments assume four equal quarters. Plenty of businesses do not work that way — a seasonal trade, a practice that bills in one lump, a year where the big project closed in November. There is a method for exactly this, and it is badly under-used.
01Why equal payments punish uneven income
The default treats your annual income as if it arrived evenly. If you earned almost nothing in the first half and a great deal in the fourth quarter, that assumption says you should have been making large payments in April on income you had not yet earned. The result is a penalty for a period in which you genuinely had nothing to pay from.
02The remedy
The annualised income installment method computes what you should have paid in each period based on what you had actually earned by that point. Instead of four equal required payments, you get four unequal ones that follow your real income curve. The IRS points to it for anyone whose income is received unevenly, and it is calculated on Form 2210.
03Who it helps most
Seasonal businesses. Anyone paid on completion of long projects. Consultants with a small number of large invoices. People who started self-employment partway through the year. And anyone whose year contained one unusual event — a property sale, a settlement, a single outsized contract — that landed late.
04What it costs you
Record-keeping. To annualise, you need income and deductions by period, not just an annual total. If your books are current this is a report. If they are not, it is an archaeology project, and the method stops being worth the effort. This is the clearest case I know of where good bookkeeping converts directly into money.
05The alternative that needs no forms
If your prior year's tax was modest, the safe harbour may be simpler and cheaper than annualising. Paying based on last year's known figure sidesteps the whole question of when this year's income arrived. Annualising is the better tool when last year's tax was high and this year's income is both lower and lumpy — which is a narrower situation than people assume. Work out which applies before doing the extra work.
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