How the statements connect¶
Picture a banker deciding whether to lend Cobalt Tutoring $10,000 for new laptops. She doesn't want four unrelated reports that happen to share a company name. She wants a system where the pieces check each other: if retained earnings went up, she can trace exactly where that gain came from and where it landed. That system rests on one equation that never breaks, one rule for how retained earnings moves, and a set of hand-offs between the four statements you just met. Once you can see the wiring, financial statements stop being four separate documents and become one connected story.
One equation that never breaks¶
Every dollar a business has came from somewhere: a lender, an owner, or earnings the business kept for itself. The accounting equation just says that out loud:
Assets = Liabilities + Stockholders' equity
Assets are everything the business owns or is owed. Liabilities are claims from lenders and other outsiders. Stockholders' equity is the owners' claim, split into common stock (what owners put in directly) and retained earnings (what the business earned and kept). The equation has to balance after every transaction, because every dollar of stuff on the left has to be claimed by somebody on the right.
Suppose Brightline Cleaning's year-end numbers look like this:
| Amount | |
|---|---|
| Assets | $42,000 |
| Liabilities | $15,000 |
| Stockholders' equity | $27,000 |
Check it: $42,000 = $15,000 + $27,000. Give two of the three numbers and the equation hands you the third.
Now suppose Brightline's owner puts another $5,000 of personal cash into the business, in exchange for more shares of stock, to help fund a new truck. Cash and common stock both rise by $5,000. Nothing was earned, so nothing changes on the income statement.
Common mistake: treating owner investment as revenue
Money owners put into the business is financing, not earning. It raises common stock and cash, but the business hasn't done anything for a customer yet. Revenue only shows up when the business delivers goods or services, not when an owner writes a check to their own company.
Retained earnings: the equation's memory¶
Retained earnings is the slice of stockholders' equity that keeps score of profits the business chose to keep instead of paying out. It moves by one rule, period after period:
Beginning retained earnings + net income − dividends = ending retained earnings
Net income adds to it, because earning money increases what the owners have a claim on. Dividends subtract from it, because the company has committed that portion of earnings to the owners rather than keeping it in the business. (When the cash actually moves is a separate question, one you'll see more of in Chapter 3.)
Cobalt Tutoring's first month
Cobalt Tutoring opens with $0 of retained earnings, since it's brand new. In its first month it earns net income of $800 and pays dividends of $200.
Ending retained earnings = $0 + $800 − $200 = $600.
That $600 is not sitting in a drawer labeled "retained earnings." It is a claim, not a pile of cash, and the two rarely match.
Common mistake: treating net income as cash
Net income of $800 does not mean Cobalt Tutoring's cash grew by $800. Net income counts revenue when it's earned and expenses when they're used up, not when cash actually moves. A customer might still owe money, or a bill might get paid next month instead. The cash story lives on the statement of cash flows, not the income statement.
How the four statements hand off to each other¶
Each statement answers one question, and its answer becomes an input to the next statement. Read down this table and you can trace a single number all the way through the set:
| Statement | Answers | Key output | Where it goes next |
|---|---|---|---|
| Income statement | How much did the business earn this period? | Net income | Into the statement of stockholders' equity |
| Statement of stockholders' equity | How did the owners' claims change this period? | Ending retained earnings, ending common stock | Onto the balance sheet as the equity section |
| Balance sheet | What does the business own, and who has claims on it, right now? | Ending cash, total assets, total liabilities and equity | The change in the cash line still needs an explanation |
| Statement of cash flows | Why did cash go up or down this period? | Net change in cash | Reconciles beginning cash to the ending cash shown on the balance sheet |
Cobalt Tutoring's cash balance grew by $350 this month, even though net income was $800. Ending cash sits on the balance sheet, but only the statement of cash flows explains that $350 increase, by splitting it into operating, investing, and financing activities.
Pause and work¶
Start with the equation itself: given two of assets, liabilities, and stockholders' equity, plus how two of them changed over the year, solve for what happened to the third.
Now try one with a piece already filled in: the change has been worked out for you, so finish the last step.
Your turn, with fresh numbers every time.
Now put it together with a full two-year picture: net income and dividends rolling retained earnings forward, stock issuances building common stock, and the accounting equation tying the ending balances to the balance sheet.
The first year's retained earnings is filled in for you; carry the logic through year two and onto the balance sheet.
Your turn, with a fresh company and fresh numbers.
Next up: who actually reads these connected statements, and why the accrual-based net income you just calculated tells a different story than the cash sitting in the bank.