Per annum meaning is “for each year” or “annually.” It may describe salary, rent, interest, a fee, inflation, or growth. The phrase states a time basis, but it does not reveal payment timing, compounding, taxes, fees, or whether the rate is nominal or effective.
Per annum examples
| Statement | Simplified interpretation |
|---|---|
| $60,000 salary per annum | $60,000 gross annual salary before deductions and benefit effects |
| $24,000 rent per annum | $2,000 per month if divided into 12 equal payments |
| 6% interest per annum | An annual rate; actual result depends on balance, timing, fees, and compounding |
| 3% growth per annum | Annual growth assumption, which may be simple or compounded |
Convert annual amounts to shorter periods
For evenly allocated amounts:
- Monthly amount = annual amount ÷ 12
- Biweekly amount = annual amount ÷ 26
- Weekly amount = annual amount ÷ 52
These are planning conversions. Actual earnings depend on contract terms, paid periods, unpaid time, overtime, commissions, taxes, and rounding. Rent or fees may also be due in unequal installments.
Simple annual interest
The simplified formula is interest = principal × annual rate × time in years. For $10,000 at 6% simple annual interest for nine months:
$10,000 × 0.06 × 9/12 = $450.
Real loans may calculate daily, use a particular day-count convention, change rates, capitalize interest, and include fees.
Compound annual growth
For annual compounding, future value = principal × (1 + rate)years. At 6% for three years, $10,000 becomes approximately $11,910.16 before tax or fees. More frequent compounding changes the result.
APR versus APY
APR and APY are not interchangeable. APR is an annualized measure defined by applicable lending rules and may incorporate specified costs. APY expresses an effective annual yield reflecting compounding under deposit rules. Always read the product’s definition, fees, compounding frequency, and assumptions.
Questions to ask when you see “per annum”
- What base amount does the rate apply to?
- Is the rate fixed, variable, nominal, or effective?
- How often is interest calculated and compounded?
- When are payments made?
- Which fees, taxes, penalties, or benefits are excluded?
- What day-count, rounding, and early-repayment rules apply?
Borrowers should pair the annual rate with the payoff methods in High-Interest Debt Strategies. For growth comparisons across years, use the Year-over-Year Growth guide.
Frequently asked questions
Does per annum mean paid once a year?
No. It states an annual basis; payments may be weekly, monthly, quarterly, or on another schedule.
Can I divide an annual interest rate by 12?
That may give a nominal monthly rate in some contexts, but it does not automatically produce the effective monthly cost. Check calculation and compounding terms.
Is 5% per annum always a 5% return?
No. Timing, compounding, price changes, fees, taxes, defaults, and withdrawals can alter the realized result.
Sources reviewed
Last reviewed: August 15, 2026. Examples are simplified and do not represent an offer, investment return, or individualized financial advice.