Quick answer
- Revenue describes preliminary tax as an estimate of Income Tax, PRSI and USC for the year.
- Self-employed people generally pay tax through self-assessment rather than PAYE payroll deduction.
- Class S PRSI can apply to self-employed income, depending on age, income level and circumstances.
- A set-aside percentage is only a planning shortcut; exact liability depends on your actual income, credits, expenses and structure.
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What a tax set-aside is trying to protect
A contractor rate can look strong until tax money is mixed with day-to-day cash. A simple tax set-aside protects against spending money that may later be needed for self-assessment, PRSI, USC, preliminary tax or accountant-reviewed liabilities.
| Area | Why it matters | Where to verify |
|---|---|---|
| Income Tax | Can apply to taxable profit or income depending on structure | Revenue self-assessment / accountant |
| USC | Can apply to self-employed income, with special treatment at higher income levels | Revenue / Citizens Information |
| PRSI | Self-employed contributors are commonly linked with Class S | Citizens Information / Revenue |
| Preliminary tax | Can require payment before the final liability is known | Revenue preliminary tax guidance |
Set-aside planning mistakes
- Using billed turnover as if it were take-home pay.
- Ignoring PRSI or USC because the contract is not PAYE.
- Forgetting preliminary tax timing.
- Setting aside tax after personal spending instead of before.
- Using one percentage forever without reviewing income changes.
2026 Pay and File timeline
Revenue’s Pay and File system combines three obligations. By 31 October 2026, a self-assessed individual generally files the 2025 return, pays any 2025 balance and pays preliminary tax for 2026. Revenue states that the 2026 ROS deadline is extended to 18 November where the return and appropriate payments are made through ROS.
| 2026 obligation | Standard date | What the cash covers |
|---|---|---|
| File 2025 Form 11 | 31 October 2026 | Previous tax year’s return |
| Pay 2025 balance | 31 October 2026 | Final liability less tax already paid |
| Pay 2026 preliminary tax | 31 October 2026 | Payment on account for current year |
| Qualifying ROS Pay and File | 18 November 2026 | Extended electronic deadline where conditions are met |
How preliminary tax is measured
Revenue lists three ways to meet the preliminary tax requirement: at least 90% of the current year’s final liability, 100% of the immediately previous year’s liability, or 105% of the pre-preceding year’s liability for qualifying direct-debit cases. The 105% option does not apply where the pre-preceding liability was nil.
These are compliance tests, not recommended savings percentages. A first-year contractor may have no previous-year liability to use as a cash guide, so a live estimate of current profit and tax is especially important.
A safer cash-flow workflow
- Move the VAT element of each receipt to a separate balance if VAT-registered.
- Update revenue, allowable costs and projected taxable profit every month.
- Transfer a conservative tax estimate to a dedicated reserve account.
- Compare the reserve with the accountant or ROS estimate each quarter.
- Increase the reserve after a rate rise, extra contract, reduced expenses or other income.
- Keep an additional operating buffer; the tax reserve is not an emergency fund.
Frequently asked questions
How much tax should contractors set aside in Ireland?
There is no universal percentage. It depends on profit, credits, expenses, USC, PRSI, pension, structure and other income.
Does preliminary tax include PRSI and USC?
Revenue explains preliminary tax as an estimate of Income Tax, PRSI and USC expected for the tax year.
Is contractor tax the same as PAYE?
Not usually. Employees normally have PAYE deducted through payroll, while self-employed taxpayers generally manage self-assessment.
What is the 2026 Pay and File deadline?
The standard deadline is 31 October 2026. Revenue lists 18 November 2026 for qualifying ROS filers who file and make the appropriate payments electronically.
Can I use last year’s tax as preliminary tax?
Revenue permits 100% of the immediately previous year’s liability as one compliance method. Confirm the figure and whether your circumstances make a larger current-year reserve prudent.
Is VAT included in the tax set-aside?
Keep VAT separate. VAT collected is not the same as an Income Tax, USC and PRSI reserve and may have different return and payment dates.
Does the calculator give my final tax bill?
No. It is a planning estimate and cannot include every credit, relief, expense, pension limit, other income source or structure-specific rule.
Sources & references
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