A day rate without a year attached is a slogan. Freelancers who still have weekends, public holidays, and unpaid admin usually land near 220 billable days, not 365. Annual gross is then day rate × 220. Hourly is day rate ÷ hours in the day (eight unless you sell six). Weekly is five times the day. Monthly is annual / 12. None of that is tax.
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Gross first, tax second
The developer day-rate calculator does that arithmetic for GBP, USD, CAD, AUD, and EUR, then hands the annual figure to the matching salary tax calculator country page via ?salary=. UK contractors go to the UK calculator, US W-2-shaped comparisons to the US one, EUR to Germany, France, Ireland, or the Netherlands. It will not know IR35, LLC elections, or your pension. It will stop you quoting £500/day as if it were £500 × 365.
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If you already think in salary, flip the mode: annual in, day rate out. The same 220 and 8 are the defaults; change them if you only sell 180 days or you bill ten-hour workshops.
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Quotes, invoices, and the rest of the site
A proposal still needs a canonical URL when you mail it; that is UTMs and OG tags, not tax. The rate tool sits next to the other campaign and Laravel utilities because the same people quote, invoice, and ship PHP. Use the tax result as a range, not a promise to a client.
Write the billable-day assumption in the quote. When a client asks why the day rate “times 365” is not the number on the invoice, you already answered.
