Dictionary / Prime Rate
What does Prime Rate mean in accounting?
Quick definition
Cash & bankingThe rate of interest charged by commercial banks on loans to preferred customers. This term guides how bookkeepers record, classify, and explain related transactions in routine financial reporting.
Read more below
Examples
A press note priced off published prime
You run a letterpress shop. On April 3 you sign a $28,000 promissory note at a community bank to buy a press. The note prices interest at the bank's published prime plus 2.25 percent; it does not lock a single rate. The April 30 coupon lists the bank's published preferred-customer rate and computes $186.40 of interest on the remaining principal. In QuickBooks Online or Xero, split the ACH so $186.40 hits interest expense and the rest pays the note, and use the prime printed on this coupon plus the 2.25 percent spread instead of a number from the news.
The rate on your statement is not prime
You run a kayak-tour company. The June 12 statement from a credit union shows the rate you actually pay on your $15,000 seasonal line of credit, and May's coupon already posted $94.00 of interest expense from the bank feed. You call that contracted rate the prime rate and you recode the $94.00 using a figure from a news site. Prime is the bank's published preferred-customer rate, not the rate on your statement. The note says prime plus 3.00 percent, so your rate is that published index plus your spread; put the $94.00 back to the coupon amount, and when a rate-change letter arrives, read the published prime and the spread separately.
Why it matters
Prime rate is the published rate commercial banks charge their preferred customers, not the rate printed on your own loan. Many small-business promissory notes and lines of credit are priced as that published rate plus a spread, so you use it to check a coupon, not to open a ledger account. You will not post this most months; it shows up when you close a floating-rate loan and whenever the bank sends a rate-change or monthly interest notice. Call your contracted rate prime and you cannot tell the bank's preferred-customer index from your markup, so a wrong interest charge looks normal and a rate-change letter looks like a new deal.
Further reading
Compare this term with reference material from other accounting and finance websites.
Keep learning
Start with the bookkeeping basics, then compare software when you are ready to pick a tool.
Getting startedBookkeeping basics for small-business ownersWhat bookkeeping is, the records you need, double-entry in plain English, and a monthly rhythm that fits a 1–50 person shop.Updated October 4, 2026
RolesWhat does a bookkeeper do?A bookkeeper records bills, invoices, and bank activity so your books stay current. See the weekly work, the month-end close, and what they do not do.Updated August 18, 2026
Monthly closeMonthly bookkeeping: what to close each monthMonth-end is the job: reconcile banks and cards, age bills and invoices, check payroll, then read the reports. A close checklist for small-business owners.Updated August 18, 2026
Receipt CaptureThe 7 Best Receipt Capture Tools for Small BusinessThe 7 best receipt capture tools for small business, ranked: OCR accuracy, QuickBooks and Xero sync, real pricing, and honest tradeoffs for each pick.Updated August 9, 2026Frequently asked questions
What is Prime Rate in bookkeeping?
The rate of interest charged by commercial banks on loans to preferred customers.
When should I use Prime Rate?
Use Prime Rate when the transaction facts match its definition and you need the ledger and financial statements to reflect the correct account and period.
What is a common mistake with Prime Rate?
Prime Rate is used for prime rate entries, while Paid-In Surplus covers a related but distinct bookkeeping purpose. Review both terms before posting unusual transactions. A common mistake is applying it by label only instead of checking the underlying transaction details.