The single biggest cash-flow mistake freelancers make is spending money that was never really theirs. When a client pays an invoice, a slice of that payment already belongs to the tax authority and your social-security fund. If you treat the full amount as income, you will eventually face a bill you cannot cover. This guide explains how much of every payment to set aside in 2026, why the right percentage differs by country and regime, and how to make the habit automatic.
The short answer most experienced freelancers give is 25% to 35% of profit. But that range hides a lot of variation. A first-year freelancer on Italy's forfettario startup rate might safely set aside around 23%, while a US freelancer paying self-employment tax on top of federal and state income tax often needs closer to 30%. Below we break it down with real 2026 rates so you can pick a number you can actually trust.
Why "Set Aside a Percentage" Beats Guessing
Freelance income is irregular. Some months are strong, others are thin, and expenses fluctuate. If you wait until the deadline to work out what you owe, you are betting that your bank balance on that day will be enough. It rarely is, because the money has already been absorbed by rent, subscriptions and living costs.
Setting aside a fixed percentage of every single payment solves this. The moment a client pays, you move a defined slice into a separate account and forget it exists. Your spendable income becomes the amount that is genuinely yours, and tax season turns from a crisis into a formality. You can estimate your own figure with our tax set-aside calculator, which factors in your regime and income level.
What You Are Actually Saving For
"Taxes" is shorthand for at least three separate obligations, and they scale very differently.
Income tax. The progressive or flat tax on your profit (revenue minus allowable costs, or revenue times a fixed coefficient under simplified regimes). It rises as you earn more, and it is the part people over-estimate.
Social security or pension contributions. This is the part people under-estimate, and at low and middle incomes it is often the larger of the two. In the US it is self-employment tax at 15.3%, charged on 92.35% of net profit (see IRS Topic 751). In Italy it is INPS, whose Gestione Separata rate for professionals with no other pension cover is 26.07% in 2026. In the UK it is Class 4 National Insurance. In Spain it is a flat monthly cuota you owe even in a month with zero invoices. These charges usually have a floor that does not shrink in a bad year.
Value-added tax (VAT/GST), if registered. VAT is money you collect from clients on behalf of the state. It is never yours, so if you charge it you must ring-fence 100% of it separately. This guide covers the first two, but never spend collected VAT.
Set Aside on Profit, Not on Every Euro That Lands
A percentage is only meaningful if you are clear about the base. Three amounts get confused constantly: the gross invoice including VAT (never the base), net revenue, and profit after deductible expenses. In a standard regime, profit is the base.
Flat-rate schemes complicate this in a helpful way. Under Italy's forfettario or Portugal's regime simplificado, your taxable base is not your real profit but a fixed percentage of revenue (78% for most Italian professionals, 75% of service income for Portuguese Category B professionals). Your actual expenses are irrelevant, which makes the set-aside percentage very predictable and is exactly why these regimes suit new freelancers.
Practical rule: if your costs are under roughly 10% of revenue, apply your percentage straight to the net-of-VAT invoice. If your costs are heavy (equipment, subcontractors, travel), apply it to profit or you will lock up cash you do not owe.
The Country-by-Country Set-Aside Table for 2026
The table below shows realistic set-aside percentages for a solo freelancer at a moderate income in 2026, as a share of profit. These are planning figures, not exact liabilities, and they assume you are registered under the relevant regime.
| Country / regime | Suggested set-aside | What it covers (2026 figures) |
|---|---|---|
| Italy: forfettario, startup years 1-5 | 23-25% | 5% substitute tax on the 78% coefficient, plus INPS Gestione Separata at 26.07% |
| Italy: forfettario, standard | 29-32% | 15% substitute tax, plus INPS Gestione Separata at 26.07% |
| UK: sole trader | 25-30% | 20% income tax above £12,570, Class 4 NI at 6% (2% above £50,270), plus payments on account |
| United States: solo freelancer | 28-32% | 15.3% self-employment tax on 92.35% of profit, plus federal income tax and state tax |
| Germany: Freiberufler | 35-42% | Income tax (14% to 42%), plus health insurance and voluntary pension |
| France: micro-entrepreneur (BNC) | 26-32% | 25.6% social contributions on turnover, plus income tax (or the 2.2% versement liberatoire) |
| Portugal: regime simplificado | 30-35% | 21.4% Social Security on 70% of service income, plus IRS on the 75% coefficient |
| Spain: autonomo | 28-35% | IRPF (quarterly Modelo 130 at 20% of net profit), plus a monthly RETA cuota of roughly EUR 200 to EUR 590 |
Sources: GOV.UK National Insurance rates, IRS, INPS, Agenzia delle Entrate, service-public.fr and Segurança Social.
Worked Example 1: An Italian Freelancer on the Forfettario
You invoice EUR 40,000 in 2026 as a professional on the forfettario, with no other pension cover, so you are in INPS Gestione Separata.
- Taxable base: 78% coefficient, so EUR 40,000 x 0.78 = EUR 31,200. Your real expenses do not change this.
- INPS: 26.07% of EUR 31,200 = EUR 8,134.
- Substitute tax base: contributions are deductible, so EUR 31,200 minus EUR 8,134 = EUR 23,066.
- At the 5% startup rate: EUR 1,153. Total due EUR 9,287, which is 23.2% of revenue.
- At the standard 15% rate: EUR 3,460. Total due EUR 11,594, which is 29.0% of revenue.
Two lessons jump out. First, the famous "5% tax" is not a 5% cost: contributions triple the bill. Second, the move from the startup rate to the standard rate adds almost six points overnight, in year six. Model it in advance with the Italian flat-rate tax calculator.
Worked Example 2: A US Freelancer With $80,000 of Profit
Single filer, no dependants, $80,000 of net profit, 2026 rules.
- Self-employment tax: $80,000 x 0.9235 = $73,880, taxed at 15.3% = $11,304.
- Half of that ($5,652) is deductible, giving an AGI of $74,348.
- The 2026 standard deduction for a single filer is $16,100, and the 20% qualified business income deduction is worth about $14,870, so taxable income lands near $43,378.
- Federal income tax: 10% on the first $12,400 ($1,240) plus 12% on the remaining $30,978 ($3,717) = $4,957.
- Federal total: about $16,261, or 20.3% of profit.
So why does the table say 28% to 32%? Because federal tax is not the whole bill. Add a typical state income tax and you are near 25%. Add a high-tax state, or a year where the QBI deduction does not fully apply, and 30% stops looking cautious and starts looking correct.
Worked Example 3: A UK Sole Trader, and the Deadlines That Catch People Out
Profit of £48,000 in the 2026/27 tax year. Income tax: the personal allowance is £12,570, so £35,430 is taxed at 20% = £7,086. Class 4 National Insurance: 6% on that same £35,430 = £2,126. Class 2 is voluntary, and with profits above the £7,105 threshold you are treated as having paid it. Total: £9,212, only 19.2% of profit.
Now the trap. Because the bill exceeds £1,000, HMRC requires payments on account. On the 31 January after the tax year ends you pay the £9,212 balance plus a first payment on account of £4,606 toward the next year: £13,818 in one day, or 28.8% of that year's profit. A further £4,606 follows on 31 July. That single mechanic is why the honest UK set-aside figure is 28%, not 19%. It is also why your second year always feels worse than your first, even when income is flat. The same logic applies to Italy's acconto and to any regime with advance payments.
The calendar matters as much as the amount:
- United Kingdom. Online return and balancing payment due 31 January, second payment on account 31 July. Filing one day late triggers an automatic £100 penalty, and late payment attracts interest plus 5% surcharges at 30 days, 6 months and 12 months.
- United States. Estimated tax is paid quarterly, normally 15 April, 15 June, 15 September and 15 January. You avoid the underpayment penalty by paying at least 90% of the current year's tax or 100% of last year's (110% if your prior-year AGI exceeded $150,000). See IRS estimated taxes.
- Italy. The balance for the previous year plus the first advance are due 30 June, with a second advance on 30 November. INPS follows the same rhythm, so two large outflows land in one year.
- Spain. Modelo 130 is filed quarterly at 20% of cumulative net profit, and the RETA cuota is debited monthly regardless of turnover.
How the Percentage Moves as You Grow
In progressive systems, a flat 25% that works at a modest income will be too little at a high one. Useful mental model: take the base percentage from the table, then add 3 to 5 points each time you cross into a higher bracket. A UK sole trader crossing £50,270 sees income tax jump from 20% to 40% on the excess (Class 4 drops to 2%, but that is a poor trade). A US freelancer crossing $50,400 of taxable income moves from the 12% bracket to 22%.
Flat-rate regimes are the exception. Italy's forfettario keeps the same 15% rate all the way to the EUR 85,000 revenue ceiling, so your percentage stays stable as you grow. Watch the cliff, though: revenue between EUR 85,000 and EUR 100,000 pushes you out of the regime from the following year, and revenue above EUR 100,000 ejects you immediately in the same year, retroactively bringing VAT and ordinary IRPF into play. If you are approaching that ceiling, raise your set-aside to 40% well before you cross it.
The Three-Account System That Makes It Automatic
You do not need accounting software. You need three accounts and one rule.
Account 1, business current account. Every client payment lands here first. Nothing is spent from here directly.
Account 2, tax reserve. The moment money arrives, transfer your set-aside percentage here. Pick an account that pays a little interest and is slightly annoying to access. If you are VAT-registered, keep collected VAT in a separate pot again.
Account 3, personal account. Transfer the remainder here as your salary. This is what you actually live on.
Run this on every payment, not monthly, so you never carry an untaxed balance. Reconcile once a quarter: compare the reserve against your year-to-date liability and adjust by two or three points, rather than making one panicked correction in month eleven.
Common Mistakes, and Who This Does Not Apply To
Even freelancers who save get caught out. The usual culprits: spending collected VAT because it sat in the same account; ignoring the payment on account or acconto; failing to raise the percentage after a strong year pushes them into a higher bracket; forgetting that fixed contributions such as Spain's cuota are owed in zero-income months; and dipping into the reserve during a slow month with a promise to put it back. The tax reserve is not an emergency fund: build a separate buffer of two or three months of costs.
The framework also has limits. It does not apply cleanly if you trade through a limited company and pay yourself a salary taxed at source, if your income is already withheld (Italian professionals outside the forfettario suffer a 20% ritenuta d'acconto on each invoice, which pre-pays part of the bill), or if you are employed and freelance on the side. In that last case your side income sits on top of your salary and is taxed at your highest marginal rate from the first euro, so set aside your marginal rate, not the average in the table.
Finally, sanity-check the bigger decision underneath the percentage: your regime. Two freelancers with identical revenue can owe very different amounts depending on whether they use a flat-rate scheme, a coefficient regime or standard accounting. Our country tax comparison tool shows how the same income is treated across regimes, and the tax glossary explains the terms you will meet. Start conservative, review the number once a year against your real effective rate, and nudge it.