Enter gross monthly income and a percentage to compare two amounts: money reserved and money remaining. This calculator performs that split; it does not work out your tax liability.
Disclaimer
This is a planning tool, not tax advice. Tax rules vary by jurisdiction and personal situation. Example percentages are scenarios, not recommended rates or a promise that you will have enough for taxes. Confirm a suitable percentage using your records and qualified advice.
How the calculator works
Gross monthly income is the amount you expect to receive before subtracting expenses or taxes. A contracted amount and cleared cash can differ, so label your estimate in your notes. The percentage is an input you choose; the tool does not infer it from income or location.
Set aside = income × percentage ÷ 100. Remaining = income − set aside.
Illustrative example: entering $8,000 and 25% gives a $2,000 reserve and $6,000 remaining. At 30%, the reserve becomes $2,400 and the remainder $5,600. That $400 difference shows the cashflow tradeoff; it does not tell you which percentage matches your actual obligations.
Remaining money must still cover expenses, owner pay, and other commitments. It is not automatically disposable income. Results use USD formatting and round to whole dollars; the calculator does not convert currencies.
Compare percentages without treating them as advice
The 20%, 25%, 30%, and 35% buttons let you compare scenarios quickly. You can enter your own percentage between 0 and 100. A larger reserve leaves less money in the remaining bucket; it does not establish that the reserve is sufficient.
Keep the basis of your chosen percentage beside your calculation: the income period, whether you used receipts or an estimate, and when you will review it. If the percentage is still unknown, use the results as scenarios while you establish an appropriate plan.
Set aside per payment or per month
For a monthly plan, enter the month's estimated receipts and compare one planned transfer. For irregular payments, the same formula can be applied to each payment when it clears. Use one approach consistently and reconcile the total so you do not reserve the same receipt twice.
Keep a weekly record
- Record payments that cleared and match them to invoices.
- Record the percentage used, reserve calculated, and transfer made.
- Save expenses and receipts alongside the income records.
- Compare remaining cash with near-term commitments and flag any shortfall.
- Review overdue invoices and schedule the next follow-up.
For the broader recordkeeping routine, use what to track weekly for taxes. For overdue receivables, use the invoice and late-payment templates.
Keep the reserve visible
Track reserved money separately from ordinary spending, using an account, sub-account, or clear bookkeeping record. If you use reserved funds, record that change so your notes show what is actually available. The calculator does not monitor balances or move money.
Common questions
Does it calculate tax on revenue or profit?
It calculates a percentage of the number entered. The input is labeled gross income; expenses, deductions, tax bands, credits, and payment deadlines are not modeled. Choosing a taxable base requires guidance specific to your circumstances.
What if my income changes?
Update the income input to compare a different month or receipt. Review the basis of your percentage when circumstances change; a larger transfer at the same percentage does not prove your plan remains adequate.
What if I cannot afford the planned reserve?
Record the gap and review income, overdue invoices, expenses, and commitments. Lowering the calculator input changes the displayed plan, not what you may owe. Get qualified help with a plan for your situation.
Does this tool save my numbers?
The calculator keeps inputs in page memory and does not save them when you reload. Its tool-interaction event identifies the calculator without including the income or percentage entered. For site-wide analytics and data handling, read the Privacy policy.
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