Every transaction, two effects¶
Chapter 1 gave you the accounting equation: Assets = Liabilities + Stockholders' Equity. That equation isn't just true on the day a company opens its doors. It has to stay true after every single transaction, for as long as the business exists. When Brightline Cleaning's founder deposits $18,000 of investor cash, buys a vacuum, prepays a few months of rent, and pays herself a dividend, each of those events has to move the equation in a way that keeps both sides equal. Learning to see both sides of every transaction, before you ever touch a ledger, is what this section teaches.
Opening up stockholders' equity¶
You already know stockholders' equity has two pieces: Common Stock, which comes from investors, and Retained Earnings, which builds up from running the business. Chapter 1 showed you how Retained Earnings rolls forward from one period to the next: a beginning balance, plus net income, minus dividends. Now write that logic into the equation itself, so it can absorb one transaction at a time.
Assets = Liabilities + Common Stock + Retained Earnings
Retained Earnings is the piece that moves as the business operates:
| Event | Effect on Retained Earnings |
|---|---|
| Revenue is earned | Increases |
| An expense is incurred | Decreases |
| A dividend is paid | Decreases |
Notice what's missing from that list: raising cash by selling stock. That changes Common Stock, not Retained Earnings, because nothing was earned. Keeping the two pieces of equity separate is the whole trick of this section.
Every transaction, two effects¶
Every external transaction changes at least two things in the equation, and it changes them by the same total dollar amount, so the equation never tips out of balance. Sometimes both changes land on the same side. When Brightline Cleaning issues stock for $18,000 cash, Assets go up $18,000 and Common Stock, part of equity, goes up $18,000 too.
Two accounts you'll see constantly from here on: Accounts Payable is what a company owes to a vendor it hasn't paid yet, and Accounts Receivable is what customers owe the company for work already done. Both let a transaction happen now while the cash moves on a different day.
Here is Brightline Cleaning's entire first month, transaction by transaction:
| # | Transaction | Assets | Liabilities | Stockholders' Equity |
|---|---|---|---|---|
| 1 | Issues stock for $18,000 cash | +18,000 | 0 | +18,000 |
| 2 | Collects $1,050 cash in advance from a customer | +1,050 | +1,050 | 0 |
| 3 | Buys $250 of supplies on account | +250 | +250 | 0 |
| 4 | Buys $2,400 of equipment for cash | 0 | 0 | 0 |
| 5 | Pays an $875 dividend | -875 | 0 | -875 |
| 6 | Prepays $1,900 of rent | 0 | 0 | 0 |
| 7 | Provides $1,250 of services on account | +1,250 | 0 | +1,250 |
| 8 | Pays a $300 utilities bill it just received | -300 | 0 | -300 |
| Totals | 19,375 | 1,300 | 18,075 |
Every row nets to zero across the equation, and the running totals still balance at the bottom. Rows 2, 4, 5, and 6 are the ones this section is really about.
Four transactions people get wrong¶
Four of the rows above trip up almost everyone the first time through, because they don't match the gut reaction to seeing cash move.
Common mistake: paying cash always creates an expense
Not true. Cash leaving the company only becomes an expense once its benefit is used up. Row 6 pays for months of rent that haven't happened yet, so the company has bought a prepaid asset, not an expense. Only the portion used up each period becomes an expense, recorded in Chapter 3.
Common mistake: cash in the door means revenue earned
Collecting cash isn't the trigger; doing the work is. Row 2's customer paid before the cleaning happened, so the company owes work, not money, and records Deferred Revenue, a liability. It becomes Service Revenue only once the job is finished.
Common mistake: buying equipment is an expense
Equipment keeps helping the business for years, so its cost isn't used up on day one. Row 4 just swaps one asset for another: Cash goes down, Equipment goes up, and total assets don't move. Chapter 3 covers how equipment's cost eventually reaches the income statement.
Common mistake: dividends are an expense
A dividend is a payout of profits already earned, not a cost of earning them. Row 5 reduces Retained Earnings directly and never touches the income statement, so it never reduces net income.
Payable now, cash later¶
Rows 3 and 7 of Brightline Cleaning's table run the same idea in both directions. Buying supplies "on account" means the supplies (an asset) arrive today while Accounts Payable, a liability, tracks what's still owed. Providing services "on account" means Accounts Receivable (an asset) goes up today, because the work was done and revenue was earned, even though the cash arrives later. In both cases, the transaction is recorded the moment it happens, not the moment cash changes hands.
Common mistake: no payment yet means no expense yet
An expense is recorded the moment it's incurred, whether or not cash has moved. A bill received but unpaid still reduces equity now, and it adds a liability for the amount owed, as in the check below. The same logic runs the other way for work done on account: revenue is earned, and equity rises, before any cash arrives.
Every one of these ups and downs is about to get its own compact shorthand, the two-column notation accountants actually write down. That's next.
Pause and work¶
Work through Brightline Cleaning's whole first month, one row at a time, with every step explained.
Now do the same for Peachtree Bike Repair, but fill in the four rows that trip people up yourself: the cash collected in advance, the prepaid rent, the equipment purchase, and the dividend.
Finally, try a fresh company with a fresh set of transactions entirely on your own.