Every number in your financial reports traces back to a single transaction. If you record that transaction as the wrong type, every report built on top of it — your net worth, savings rate, cash flow statement — will be wrong. Not approximately wrong. Precisely wrong.

This guide walks through every transaction type you will encounter in personal finance, explains how each one affects your accounts and reports, and gives you a reliable decision framework for choosing the right type every time.

Before You Start: Liquid vs Non-Liquid Accounts

Before we talk about transaction types, you need to understand the three categories of accounts — because the type of account a transaction touches determines how it shows up in your reports.

Cash and Liquid Accounts

These are your everyday spending and saving accounts: bank checking accounts, savings accounts, cash in your wallet, digital wallets like Apple Pay or PayPal. The defining characteristic is that you can spend the money directly, today, without selling anything first.

Non-Liquid Accounts

These hold value but you cannot spend them directly. Examples include gold holdings, investment portfolios, real estate, cryptocurrency, retirement accounts, and receivables (money others owe you). To spend this money, you would need to sell or liquidate the asset first.

Liability Accounts

These represent what you owe: credit card balances, personal loans, mortgages, student loans, or money you borrowed from family. Liability balances are negative — they reduce your net worth.

Why does this matter? Because cash flow only tracks money moving through your liquid accounts. If you buy gold with your checking account, your cash flow shows an outflow even though your net worth is unchanged. If you record that gold purchase as an "expense" instead of a "transfer to a non-liquid account," your savings rate drops to zero — even though you actually saved by converting cash to gold.

Income: Money Entering Your Life

Income is the simplest transaction type to understand: money comes into one of your accounts from an external source, increasing your total wealth. The amount is always positive.

Common Examples

• Salary and wages: Regular employment income deposited into your bank account
• Freelance and side hustle income: Payments for contract work, consulting, or gig economy earnings
• Gifts received: Birthday money, wedding gifts, monetary gifts from family
• Government subsidies and benefits: Tax refunds, stimulus payments, child benefit payments
• Investment returns: Dividends, rental income, profit distributions
• Selling personal items: When you sell something for more than tracking purposes require

How Income Affects Your Metrics

Income is the only transaction type that increases your net worth. This is why accurately categorizing income matters so much — overstating your income inflates your apparent savings rate and paints a misleading picture of your financial progress.

Expenses: Money Leaving Your Life

Expenses are the mirror of income: money leaves one of your accounts to pay for goods or services, permanently reducing your total wealth. The amount is always negative in its effect on your balance.

Common Examples

• Rent or mortgage payments: Your housing cost (note: the interest portion of a mortgage is an expense; the principal portion is a transfer — more on this later)
• Groceries and food: Supermarket purchases, restaurant meals
• Utility bills: Electricity, gas, water, internet, phone
• Transportation: Fuel, public transit fares, car insurance, maintenance
• Subscriptions: Streaming services, gym memberships, software licenses
• Healthcare: Doctor visits, medications, insurance premiums

How Expenses Affect Your Metrics

Expenses are the only transaction type that decreases your net worth. Every other apparent "loss" — like moving money to investments — is actually a transfer that preserves your wealth in a different form.

Transfers: Moving Money Between Your Own Accounts

A transfer moves money from one of your accounts to another. It always has two legs: the source account is debited (balance decreases) and the destination account is credited (balance increases). The total across both accounts is zero — nothing is gained or lost.

Common Examples

• Moving money from checking to savings
• Paying off a credit card from your bank account
• Buying gold or investments with cash
• Transferring between bank accounts at different institutions
• Converting one currency to another across your own accounts

Why Transfer Direction Matters for Cash Flow

While all transfers leave net worth unchanged, the direction of a transfer determines how it appears in your cash flow statement:

• Cash to non-liquid (e.g., buying gold): Shows as an investing outflow — cash left your liquid accounts to acquire an asset
• Non-liquid to cash (e.g., selling investments): Shows as an investing inflow — you converted an asset back into spendable cash
• Cash to liability (e.g., paying off a loan): Shows as a financing outflow — you used cash to reduce a debt obligation
• Cash to cash (e.g., checking to savings): No net cash flow effect — money just moved between liquid accounts

Multi-Currency Transfers

When you transfer between accounts denominated in different currencies, the source and destination amounts may differ due to exchange rates. For example, transferring $1,000 USD to a Euro account might credit EUR 920. Both legs should be recorded at their respective currency values — Kimia handles this automatically by letting you set the amount independently on each leg of the transfer.

"A transfer never changes your net worth — it only changes where your money sits. Understanding this single principle prevents 90% of personal finance tracking errors."

Starting Balance: Setting Up Your Accounts

When you first add an account to your finance app, you need to tell it the current balance. This is your starting balance — a special transaction type that initializes the account without pretending the money is new income.

• For asset accounts (bank accounts, cash, investments): the starting balance is positive, reflecting what you already own
• For liability accounts (credit cards, loans): the starting balance is negative, reflecting what you already owe

The critical distinction: a starting balance does NOT count as income. It does not appear in your income vs. expense reports. It does not affect your savings rate calculation. It does not show up in your cash flow statement. It simply tells the app "this account already had this much money before I started tracking."

If you mistakenly record a starting balance as income, your first month's reports will show a massive income spike that never actually happened — destroying the accuracy of every metric built on top of it.

Adjustments: Fixing the Numbers

Sometimes your bank balance and your app balance disagree. Maybe you forgot to record a small cash purchase. Maybe a bank fee was charged that you missed. Maybe you counted your physical cash and it is $20 less than expected.

An adjustment corrects the account balance without categorizing the change as income or expense. It is an acknowledgment that the numbers drifted and you are bringing them back in line with reality.

• A positive adjustment increases the account balance (you had more than you thought)
• A negative adjustment decreases the account balance (you had less than you thought)

Like starting balances, adjustments are excluded from income/expense reports, savings rate calculations, and cash flow statements. They exist purely to keep your balances accurate without contaminating your financial metrics.

Use adjustments sparingly. If you find yourself making frequent adjustments, it is a sign that you need to record transactions more consistently — not that your app is broken.

Split Transactions: One Purchase, Multiple Categories

Real-world purchases rarely fit neatly into a single category. A trip to the supermarket might include groceries, toiletries, household cleaning supplies, and a birthday card. Each of these belongs in a different budget category.

A split transaction lets you record one purchase and divide it across multiple categories — and even across multiple accounts if needed.

Example: A Supermarket Receipt

Total: $110.00 — one transaction, four categories. Your budget reports now accurately reflect how much you spent in each area, rather than dumping the entire amount into "Groceries."

In Kimia, you can split any income or expense transaction into as many lines as needed, assigning each line its own category, amount, and optional note.

Debt and Loans: The Double-Entry Reality

Debt is where most people make tracking mistakes — because a single loan event actually involves multiple transaction types.

When You Borrow Money

Taking out a $10,000 personal loan creates two simultaneous effects:

1. Your bank account increases by $10,000 (asset goes up)
2. A new loan liability of $10,000 appears (liability goes up)

The net effect on your net worth? Zero. You gained cash but you also gained an equal obligation. This is why borrowing should be recorded as a transfer — from the liability account to the asset account — not as income.

When You Lend Money

If you lend $500 to a friend, the money leaves your bank account but you have a receivable — someone owes you $500. Record it as a transfer from your bank account to a "Receivables" non-liquid account. Your net worth is unchanged; the money just changed form.

Loan Repayment: Principal vs Interest

Each monthly loan payment typically contains two components:

• Principal repayment: This reduces your loan balance. It is a transfer from your bank account to the liability account. Net worth is unchanged — you are losing cash but also losing an equal amount of debt.
• Interest payment: This is a real expense. The money leaves your account and goes to the lender as profit. Your net worth decreases. This is why interest is so costly — it is the only part of a loan payment that actually makes you poorer.

Amortization: The Shifting Split

In a typical amortized loan (like a mortgage or car loan), the split between principal and interest changes over time. Early payments are mostly interest with very little principal reduction. Later payments are mostly principal with very little interest. This is why the first years of a mortgage feel like you are making no progress — because most of your payment is an expense (interest), not a wealth-preserving transfer (principal).

Scheduled Transactions: Automate the Predictable

Many transactions recur on a predictable schedule: your salary arrives on the same date each month, rent is due on the first, loan installments debit automatically, subscriptions charge monthly. Entering these manually each time is tedious and easy to forget.

Scheduled transactions are templates that automatically generate transaction instances on a recurring basis. You set up the template once — defining the amount, account, category, and frequency — and the app creates the actual transaction each time it comes due.

Common Scheduled Transactions

• Monthly salary: Income, credited to your bank account on payday
• Rent or mortgage payment: Expense (or split expense + transfer for mortgage principal), debited on the due date
• Loan installments: Transfer (principal) + expense (interest), debited on the payment date
• Subscription services: Expense, charged monthly or annually
• Savings transfers: Transfer from checking to savings, executed on payday

In Kimia, scheduled transactions appear in your upcoming transactions list so you can see what is coming before it hits your account. You can also pause, skip, or modify individual instances without changing the template.

Quick Reference: 5 Transaction Types Compared

Decision Guide: What Type Should I Use?

When you are unsure which transaction type to use, walk through this decision tree:

Money Came In

1. Did the money come from one of your own accounts? → Transfer
2. Do you have an obligation to return it? (e.g., a loan) → Debt (transfer from liability to asset)
3. Is it truly new money with no repayment obligation? → Income

Money Went Out

1. Did you buy a good or service that is consumed? → Expense
2. Did the money go to one of your own accounts? → Transfer
3. Did you pay off a debt (principal)? → Debt transfer (transfer from asset to liability)
4. Did you buy an asset you still own (gold, stocks, property)? → Transfer to non-liquid account
5. Did you pay interest or fees on a loan? → Expense

Neither In Nor Out

1. Are you setting up an account for the first time? → Starting Balance
2. Does your real balance not match the app? → Adjustment

When in doubt, ask yourself: "Did my total wealth change?" If yes, it is income or expense. If no, it is a transfer, starting balance, or adjustment.