The accounting equation, made dead simple.

What is the accounting equation?

The accounting equation is the one line every commerce student meets first:

Assets = Liabilities + Capital

In plain words: everything a business owns (its assets) has been paid for from just two sources — money it owes to outsiders (liabilities) and money the owner has put in, plus profits kept in the business (capital, also called owner's equity). The left side lists the resources; the right side lists who supplied them. They describe the same rupees from two angles, so they are always equal.

Capital is sometimes shown on the left as Assets − Liabilities = Capital. Same equation, just rearranged — capital is simply what's left for the owner after outsiders are paid off.

The three terms, in one table

Before we watch it balance, get the vocabulary straight. This is the whole equation in one place.

The expanded equation shows where day-to-day items sit: Assets = Liabilities + Capital + Revenue − Expenses − Drawings. Revenue and profit push capital up; expenses, losses and drawings pull it down. Everything still nets back to the original three terms.

Why it can never break

Here's the beautiful part: every transaction touches at least two items, and the two effects always keep the sides equal. There are only four things a transaction can do:

• Increase an asset and increase a liability or capital (e.g. take a loan — cash up, loan up).
• Decrease an asset and decrease a liability or capital (e.g. repay a loan — cash down, loan down).
• Increase one asset and decrease another asset (e.g. buy furniture for cash — furniture up, cash down).
• Increase one liability/capital and decrease another (e.g. convert a supplier's dues into a loan).

In every case the equation stays balanced. This is the same truth as the double-entry system and the golden rules of accounting: assets rise on the debit side, liabilities and capital rise on the credit side, and every entry has equal debits and credits.

Live worked example — six transactions that stay balanced

Meet Rohan, who opens a small trading shop. We'll record six transactions and, after each one, read off the three running totals. Watch the last three columns: Assets always equals Liabilities + Capital. All figures in ₹.

Final check: Assets ₹7,40,000 = Liabilities ₹2,00,000 + Capital ₹5,40,000 — the two sides tie out to the rupee. Notice transaction 3 (furniture for cash) didn't change any total: one asset simply became another.

The same closing position as journal entries

Every row above is really a journal entry with equal debits and credits. Here are transactions 1, 2 and 4 written out — see how total debit = total credit each time, which is exactly the equation staying balanced.

Debits ₹7,80,000 = Credits ₹7,80,000. A balanced journal is nothing more than the accounting equation, recorded one transaction at a time. Next stop: journal entries in full and the balance sheet, which is just a tidy summary of these same balances.

Common mistakes & student tips

• Treating drawings as an expense. When the owner takes cash for personal use, it doesn't reduce profit — it reduces capital directly. Assets down, capital down.
• Thinking GST collected is income. Output CGST/SGST you collect on a sale is a liability (GST payable) until you deposit it. It never touches capital.
• Forgetting the second effect. If your books won't balance, you almost certainly recorded only one side of a transaction — not the equation failing. Find the missing half.
• Confusing capital with cash. Capital is the owner's claim, not a pile of money. A business can have large capital and very little cash.
• Tip — sanity-check after every transaction. Ask: "Which two items moved, and do they keep Assets = Liabilities + Capital?" If yes, your entry is sound.
• Tip — Indian number format. Write ₹5,40,000 (lakh grouping), not ₹540,000. Examiners in India expect the lakh/crore comma pattern.

In TatvaBooks, this happens automatically

On paper you keep the equation balanced by hand, checking two effects on every line. In TatvaBooks, the software enforces it for you: every voucher you post is double-entry by design, so it cannot save an entry where debits don't equal credits. Your balance sheet is always in balance, GST payable is tracked as its own liability the moment you raise a GST invoice, and profit flows into capital automatically at year-end.

You still need to understand the equation — but you never again lose an evening hunting for the ₹100 that made your trial balance disagree. That's the honest bridge: learn the theory here, let the tool keep the arithmetic exact.

Frequently asked questions