What does NAP Calculators do?

Interest, insurance and taxes to NAP. Current rates. Output is an indicative estimate for 2026—not legal, tax, or financial advice. Verify with official rules and a professional if needed.

Do I need to sign up?

No account is required. The calculator runs in your browser for quick estimates; always double-check for contracts or tax filings in 2026.

How accurate is the result?

It depends on your inputs and the model’s assumptions. Use it for planning and what-if analysis; for binding decisions, confirm numbers from primary sources and advisers.

Is my data stored on the server?

Results are not meant to be posted publicly; some tools may use local device storage (see the tool’s on-page copy).

NAP Calculators

Interest, insurance and taxes to NAP. Current rates.

Late-payment interest

Statutory interest for NRA debts

Social security

Employee / self-employed contributions

Taxes

Indicative tax base tools

Deadlines

Important dates and reminders

Sanctions

Indicative sanctions and interest

Methodology

NRA calculator pack — links to individual tools

Methodology

Related tools