How to draft a simple monthly budget when your income is irregular

Gather your last 3-6 months of income

Open your bank app or your records and pull up every deposit that counts as income for the past 3-6 months. Write each one down with the date and amount, even if it came in three small drops from the same client. On your screen — or in your notebook — you'll see a growing list that looks something like "May 14 — $1,200; May 28 — $400; June 3 — $900." If your bank app shows only running totals, tap a deposit to see the date and amount separately.

If you use a bookkeeping app or a spreadsheet, filter by deposits and copy the list out. If you only have paper statements, a calculator and a pen will do — just write each amount in a list as you go.

You'll know it worked when you have a single list of every income amount that landed in your account over the last few months, with the date next to each one.

Find your baseline month

Add up the income from each month on your list and write the total next to that month. Then circle the lowest total — not the average, the lowest. That number is your baseline: the smallest amount you have actually earned in any recent month. It is the floor you can count on when work slows down. Think of it like the lowest tide you've seen recently. The ocean does not stay at low tide, but if you build your house above the low-tide mark, you'll never flood.

You'll know it worked when you can point to one number that represents the smallest monthly income you've earned recently, and that number feels realistic — not aspirational, not zero.

List your fixed essentials

On a fresh page or new section, write down every expense you absolutely have to pay each month, no matter what. Rent or mortgage, utilities, groceries, insurance premiums, minimum debt payments, phone bill, transit to work. Skip anything optional for now — eating out, subscriptions, hobbies, gifts — those come later. Be honest about which bills are truly essential and which ones only feel essential.

If a bill comes quarterly (every three months) instead of monthly, divide it by three and write the monthly share. A $600 insurance bill every three months becomes $200/month on your list.

You'll know it worked when you have a single list of essential monthly costs that, added together, gives one clear number — and that number is only a little higher than your baseline.

Open a buffer account and pick a savings percentage

A buffer is money you set aside during good months so you can pay your bills during slow ones. Open a separate savings account just for this — even a basic one your bank offers for free — so the money is harder to spend by accident. Then decide what percentage of every payment you'll move into the buffer before you budget anything else. A common starting range is 10-20%, but pick what you can honestly stick with. Imagine your buffer like a fuel tank — every payment fills it a little, and every slow month you drive on what you've saved.

If your bank does not let you open a second account quickly, use a labeled folder inside your existing savings account and treat it the same way. If automatic transfers feel like too much setup, a manual transfer right after each payment works too.

You'll know it worked when the buffer account (or labeled folder) exists, you have a percentage picked, and you've moved at least one amount into it.

Calculate your "safe to spend" number

For any given month, take your baseline from Step 2, subtract your essentials from Step 3, and the remainder is your "safe to spend" amount for that month. If the remainder is small or negative, that's important information — it means your baseline is too low to cover basics, and you may need to grow income, cut an essential, or lean harder on the buffer until income recovers.

During a high-income month, you can spend a little more freely — but not a lot more. A simple rule is to keep your "safe to spend" number the same every month so your spending stays predictable, and let anything extra above it flow into the buffer.

You'll know it worked when you can do this math for any month's income in under a minute and feel confident the answer is honest.

Track actual spending against the plan

Once a week — Sunday morning works for most people — open your notes or app and write down what you actually spent over the past seven days. Compare it to your safe-to-spend number. If you are tracking in a notebook, two simple columns work: "Spent this week" and "Remaining this month." If you are using an app, just check the totals against your plan.

The goal is not perfection — it's noticing. Most people who track for the first time are surprised by where the small amounts go: coffee, snacks, a forgotten subscription.

You'll know it worked when you can answer "How much have I spent so far this month?" without guessing.

Review and adjust after 30 days

At the end of the first month, sit down for 20 minutes and look at the full picture. Did your baseline feel right? Were your essentials accurate? Did the buffer grow? Did "safe to spend" cover what you actually needed? Write one short note about what to change next month, then start the new month with the updated numbers.

This system is a draft, not a final document. The first month is a test run, and the test almost always reveals something you didn't expect.

You'll know it worked when you have a written budget you actually use, a buffer that's growing even slowly, and a clear next-month number you trust.