See how much unpaid invoices are really costing you. Slide in your numbers and get the tied-up-cash figure in seconds.
The annual rate your cash could earn — or costs you when it's stuck in receivables (a line of credit, a card balance, or the next job's materials).
Every day an invoice sits unpaid, that money isn't working for you. It's cash you can't use for materials, payroll, or the next job — so you float it on a credit card or a line of credit, or you simply go without. This calculator estimates the carrying cost of that tied-up cash based on how much you invoice, how long you wait, and what your capital costs.
We take your average daily billings and multiply by the days clients pay beyond your terms to get the cash tied up late. Then we apply your cost of capital to turn that into a monthly and annual dollar figure. It's a conservative estimate — it doesn't even count the invoices that never get paid at all, or the hours you spend chasing them.
Sparkbill sends invoices by text with a Pay Now button (card + ACH) and auto-chases them with reminders until they're paid. Trades on Sparkbill get paid about two weeks faster — pulling that cash off the calculator above and back into your account. You keep your own Stripe; we take 0% markup.