Keep 55300 free, accurate and independent
No paywalls, no sign-up walls, no sold data. Your support pays for servers, yearly tax-data updates, new calculators, promotion, the people who build them and prizes for our community contests.
Where your money goes
Choose an amount
Secure checkout is handled by the payment provider. We never see or store card numbers.
Pledge or give monthly
Prefer a bank transfer, a monthly gift, or giving on behalf of a company? Send a pledge and we'll reply with a secure link and a receipt.
Supporter perks
- Name on the Supporters wall (optional)
- Early access to new calculators
- Vote on the next tool we build
- $300+: credit on a calculator page
Support FAQ
Is my donation tax-deductible?
No. 55300 is an independent website, not a registered charity, so contributions are not tax-deductible.
How do I pay?
Use any payment button shown. If a button says 'pledge', submit the pledge form and we'll reply with a secure payment link — we never ask for card details by email or form.
Can I give monthly?
Yes — choose 'Monthly' in the pledge form and we'll set up a recurring link you can cancel anytime.
Can my company sponsor instead?
Yes. Sponsorships include visible, clearly-labelled recognition. See Advertise & sponsor.