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Imagine you invest 100,000intoanewpartnership,whileyourpartnerinvestsjust100,000 into a new partnership, while your partner invests just 20,000 — yet you agree to split final profits equally. How do you make sure your larger financial commitment is rewarded fairly?
In partnership accounting, partners use interest on capital and interest on drawings to level the playing field before dividing residual profits.

Rewarding Investment: Interest on Capital

A capital contribution is the total money or assets a partner permanently invests into the firm. Interest on capital acts as a return on this investment, compensating partners who commit more funds to the business.
We calculate interest on capital by multiplying the partner's fixed capital balance by the agreed annual interest rate: Interest on Capital=Capital Balance×Interest Rate×Months12\text{Interest on Capital} = \text{Capital Balance} \times \text{Interest Rate} \times \frac{\text{Months}}{12}
Because interest on capital is a distribution of profits rather than an operating expense, it is recorded in the Profit and Loss Appropriation Account — the account that shows how net profit is divided among partners.
What happens when a partner takes money out of the business for personal use during the year?

Penalizing Withdrawals: Interest on Drawings

Drawings are cash or assets withdrawn by a partner for personal use. Interest on drawings is a penalty charged on these withdrawals to discourage partners from draining the firm's cash reserves.
If a partner draws cash midway through the financial year, interest is charged only for the remaining fraction of the year: Interest on Drawings=Amount Drawn×Annual Rate×Months Held12\text{Interest on Drawings} = \text{Amount Drawn} \times \text{Annual Rate} \times \frac{\text{Months Held}}{12}
This interest is income to the partnership (increasing total profit to share) and a cost to the partner, which reduces their current account balance.