Tax Buffer Calculator
A tax reserve is money you set aside from gross income so that when a tax bill arrives, the funds exist. This tool calculates your monthly and annual reserve target based on expected income and a reserve percentage you choose — so you can automate transfers and stop thinking about it.
Recommended annual reserve
$30,000.00
Recommended monthly reserve
$2,500.00
Why freelancers need a dedicated tax reserve
In employment, income tax and National Insurance (or equivalent) are deducted before pay reaches your account. As a freelancer, clients pay your gross fee in full. The tax obligation is yours to calculate, set aside, and pay — often months after the income was earned. Without a deliberate reserve system, it is easy to spend money that belongs to the tax authority.
The fix is simple: treat tax as a line item removed from every payment at the moment it arrives, transferred immediately to a separate account. This calculator helps you set the right percentage so the transfer is automatic and accurate.
What taxes the reserve needs to cover
Your reserve percentage needs to cover more than just income tax:
- UK: Income tax (20% basic rate, 40% higher rate above £50,270) plus Class 4 National Insurance (6% between £12,570–£50,270, 2% above). Combined effective rate at mid-range freelance incomes typically lands around 27–33% of gross profit after personal allowance.
- US: Self-employment tax (15.3% up to the Social Security wage base) plus federal income tax (10–37% marginal) plus state income tax (0–13%+). Total effective rate often 28–38% depending on state and deductions.
- Australia: Income tax at marginal rates plus 2% Medicare levy. Common effective rate for mid-income sole traders: 27–32%.
- Other markets: Consult a local accountant for jurisdiction-specific rates and contribution requirements.
Worked example
| Scenario | UK freelancer (30% reserve) | US freelancer (33% reserve) |
|---|---|---|
| Annual gross income | £60,000 | $80,000 |
| Reserve percentage | 30% | 33% |
| Annual reserve amount | £18,000 | $26,400 |
| Monthly transfer target | £1,500/month | $2,200/month |
| Per £1,000 payment received | £300 transferred | $330 transferred |
Applying the reserve to each payment as it arrives — rather than monthly or quarterly — tracks actual cash inflow precisely, which is especially useful when income is irregular.
The transfer workflow
- Open a dedicated savings account labelled clearly as your tax reserve (separate from your operating account).
- When a client payment arrives, transfer the reserve percentage immediately — same day if possible.
- Do not use this account for anything else. Treat the balance as already spent.
- After your first full tax filing, compare what you reserved against what you actually owed, then adjust the percentage for the next year.
Cross-check your reserve against your rate in the Rate Calculator to confirm your after-tax income target is still met. For a detailed breakdown of what taxes freelancers owe by region, read the Tax Reserve Guide.
Tax rates and thresholds vary by country, income level, and entity structure. Verify with a qualified accountant. UK reference: HMRC Self Assessment. US reference: IRS Estimated Taxes.
How to read the results
The reserve percentage is a planning estimate, not a precise tax bill. Start conservatively, compare against your first filing, and adjust. Overestimating is recoverable — underestimating is a cash-flow crisis.
The monthly transfer target assumes consistent income. If income is irregular, apply the reserve percentage to each payment as it arrives rather than using the monthly average figure. This is more accurate when income peaks and troughs sharply.
Best practice
Start at the higher end of your estimated range (28–30% for most UK freelancers, 30–35% for US). It is much easier to transfer surplus back to your operating account than to find shortfall at filing time.
Worked example
At 30% reserve on £60,000 annual income, transfer £1,500/month or £300 per £1,000 received. After filing, adjust the rate if you consistently over- or under-reserved.
Swap your own assumptions to create a quote-ready number or policy clause.
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FAQ
Reserve from gross receipts — the full amount the client pays. This is simpler and safer. Your accountant will calculate the actual tax from your net profit after deductions, and any surplus reserve is refunded or rolled forward.
Apply the reserve percentage to each individual payment rather than a monthly average. When a £5,000 payment arrives, transfer £1,500 immediately (at 30%). When a quiet month produces nothing, no transfer is needed. This automatically tracks real inflow.
Contact your tax authority before the deadline. Both HMRC and the IRS offer payment plan arrangements for taxpayers who engage proactively. Penalties for late contact are lower than penalties for ignoring the bill entirely.
Yes, significantly. A limited company pays corporation tax on profits, and director salary and dividends are taxed differently from sole trader income. If you are considering incorporating, model the numbers with an accountant before making the decision.