Tax Set-Aside Calculator

When to use this

• You want fewer surprises and a default set-aside habit.
• You are inconsistent with income and need a simple rule.

Freelance taxes feel stressful for a simple reason: they turn predictable work into unpredictable cashflow. You can do great work, get paid, and still feel uneasy because you do not know how much of that money is already spoken for.

This calculator is meant to reduce that ambiguity. You give it an estimate of your gross monthly income and a set-aside percentage. It returns two monthly buckets: what to set aside, and what remains for everything else. The math is simple on purpose, because the goal is not precision. The goal is a repeatable habit that prevents surprises.

How the calculator works

The Tax Set-Aside Calculator is deliberately small. It asks for two values and shows two results. That simplicity is a feature: it keeps the habit easy to maintain even when you are busy, stressed, or juggling multiple clients.

Input 1: Gross monthly income (estimate)

Gross monthly income is your best estimate of how much money you will bring in over a month before taxes. It is an estimate because freelance income is often lumpy: you might invoice in one month and get paid in the next, or land a project that changes your monthly average.

If you are unsure what number to enter, use the estimate that matches the way you actually get paid. For example:

• If you are paid per project and payments arrive irregularly, you can use a rolling average based on the last few payments.
• If you are on a retainer, you can use your contracted monthly amount.
• If you are ramping up, you can use a realistic month (not your best month, and not your worst month).

Input 2: Set-aside percentage

The set-aside percentage is the portion of your gross monthly income you want to treat as not-spendable for now. The calculator multiplies your gross estimate by this percentage, then shows you how much to set aside.

The important part is not the exact number. The important part is that you pick a number you can follow consistently, then revisit it once you have real tax history and cleaner bookkeeping.

Outputs: Monthly buckets

The calculator shows two buckets:

• Set aside: the amount you plan to reserve for taxes.
• Remaining: what is left for expenses, owner pay, and everything else.

Think of these as budgeting buckets, not a statement about what you will owe. When you are freelancing, you are constantly deciding what you can safely spend. These two buckets make that decision less emotional.

Formatting: USD, rounded to whole dollars

Results are displayed in USD and rounded to whole dollars for readability. If you work in a different currency, you can still use the same planning habit.

How to pick a conservative default percentage

The hardest part of set-aside is not the transfer. It is the hesitation: you do not want to pick the wrong number, so you pick nothing, which is the worst outcome.

A conservative default is not a universal percentage. It is a number that is intentionally biased toward preventing a shortfall, while still being feasible for you to follow. Here is a practical way to choose one without turning it into a research project.

Step 1: Start with uncertainty, not optimism

If you do not have solid tax history as a freelancer, you are operating with uncertainty. In that situation, the right mindset is not, "What is the perfect rate?" It is, "What default makes it unlikely that I am caught off guard?"

Conservatism is about avoiding a bad outcome, not maximizing current spending. You are buying peace of mind and optionality.

Step 2: Identify what could make your effective rate higher

Without going into jurisdiction-specific rules, there are common factors that can change how much you owe. For planning, you do not need to compute these precisely. You just need to know whether your situation is likely to be simpler or more complex.

• Income variability: if your income swings a lot, your set-aside needs to handle high months without you spending everything immediately.
• Multiple income sources: if you have other income streams, your tax picture can be less intuitive than "freelance income times a rate."
• Complexity overhead: if you have multiple entities, partners, or unusual arrangements, it is safer to plan with a buffer.

The point is to notice when your situation suggests extra uncertainty, and to pick a default that is resilient to it.

Step 3: Choose a number you will actually follow

A conservative default that you abandon is not conservative. A slightly less conservative default that you follow for a full year is better than a theoretically perfect number that you ignore after one rough month.

If you suspect you will "borrow" from your set-aside bucket, lower the friction instead of relying on willpower. Put the set-aside somewhere separate and boring. Make the transfer automatic when possible. Treat it like a bill you pay to your future self.

Step 4: Build in a review cadence

Your first default is a placeholder. The real goal is to replace guessing with data. That means you need a review cadence: a simple moment where you look at what happened and decide whether to adjust.

A practical approach is to review after you have accumulated enough history to see patterns (for example, after a quarter or two of cleaner bookkeeping). If you work with an accountant or tax professional, that is also a good moment to ask for a planning percentage that fits your situation.

Per-payment vs per-month set-aside

The calculator shows monthly buckets because that is easy to reason about. But many freelancers do not experience income monthly. They experience income as sporadic payments that show up at inconvenient times.

The fix is simple: treat set-aside as a percentage rule applied to payments, not a monthly resolution.

Per-month set-aside: best when your income is smooth

A per-month approach works well when you have stable retainers or a predictable schedule of payments. You estimate gross monthly income, set aside the planned amount once a month, and the remaining bucket is your spendable operating money.

Pros of a per-month approach:

• Simple mental model: one planned transfer per month.
• Easy to align with rent, subscriptions, and other monthly bills.
• Works well when your income does not swing wildly.

Where it breaks:

• You have an unusually high month and spend the surplus before you make the set-aside transfer.
• You have a low month and feel tempted to skip set-aside entirely.

Per-payment set-aside: best when your income is lumpy

A per-payment approach means you apply the percentage rule every time you receive a payment. When money lands, you immediately move the set-aside portion into the tax bucket. What stays behind is what you can use for expenses and pay.

Pros of a per-payment approach:

• The habit happens at the moment of cash inflow, when the money is actually there.
• It prevents "accidental spending" of money that should be reserved.
• It scales naturally with unpredictable income.

Where it breaks:

• You do not have a reliable way to detect payments (for example, if money arrives through multiple platforms and accounts).
• You do not have separation between buckets, so transfers feel like a manual chore.

A simple rule: pick the cadence that matches reality

If your income is smooth, monthly transfers are fine. If your income is inconsistent, per-payment set-aside is usually steadier because you are tying the habit to cash events rather than calendar dates.

You can even do a hybrid: set aside per payment, then use the calculator as your monthly check to see whether your bucket totals still match your planning assumptions.

A simple weekly workflow (bookkeeping tie-in)

The calculator is a starting point. The stress reduction comes from combining the percentage rule with a small weekly routine. The weekly routine is what turns set-aside into a system instead of a good intention.

If you want a more complete checklist of what to track, use the Codex companion page on what to track weekly for taxes. This section focuses specifically on how to tie set-aside to a weekly bookkeeping rhythm.

The goal of the weekly routine

Your weekly routine should do three things in a predictable order:

• capture what happened (income and expenses),
• move money into the right buckets (including set-aside),
• create a short paper trail so future-you can file without panic.

Weekly workflow (20 to 30 minutes)

1. Collect payments received. Look at your bank account and list every client payment that cleared this week. If you track invoices, mark which ones moved from "sent" to "paid."
2. Apply the percentage rule. For each payment, compute your set-aside amount using your chosen percentage. If you are using a per-month approach, compute the monthly set-aside once and skip the per-payment step.
3. Move the money. Transfer the set-aside amount into a separate bucket. The bucket can be a separate account, a sub-account, or any method that creates separation.
4. Record expenses and receipts. Add this week's expenses to your bookkeeping system and save receipts in one place. Do not aim for perfect categorization. Aim for completeness.
5. Sanity-check your runway. Look at your remaining bucket and confirm you can cover near-term bills. If you cannot, fix cashflow now instead of stealing from the set-aside bucket silently.
6. Follow up on late invoices. If invoices are overdue, follow a sequence instead of improvising. The goal is to make collection boring and procedural. If you need a template, use the invoice template and late payment follow-up sequence.

Make the routine easier by shrinking your toolset

A good benchmark is a solo operating system with a small number of tools that work together. If you want a practical list, see solo operating system tools that reduce admin.

Make it boring: buckets, transfers, consistency

Set-aside fails when it is treated as a vague promise. It succeeds when it is treated as a system with defaults.

Separate the money so you stop renegotiating with yourself

The biggest psychological win is separation. When set-aside money lives in the same place as spendable money, every purchase becomes a decision. When the money is separate, you do not have to think about it.

You can create separation in different ways. The method matters less than the outcome: you can see the bucket and you can avoid dipping into it casually.

Prefer defaults over willpower

If you want the habit to survive chaotic weeks, build defaults:

• A default percentage you use unless you have a specific reason to change it.
• A default transfer cadence (per payment or per week) that does not depend on your mood.
• A default review moment where you adjust based on reality, not hope.

Watch for the quiet failure mode: borrowing from set-aside

Many freelancers do not "stop setting aside." They borrow from the bucket during a tight month and plan to refill it later. Sometimes that is unavoidable. But if it becomes a pattern, it is a signal that your operating system needs help.

If you are borrowing repeatedly, look for a root cause:

• Invoicing and collections: are you following up consistently when invoices are late?
• Pricing: are you undercharging and creating a permanent cash crunch?
• Expense creep: are recurring costs rising without a matching increase in revenue?

The calculator cannot fix those problems, but it can make them visible earlier. That is still valuable.

FAQ

Is this tax advice?

No. This is a planning tool that helps you set aside money using a simple percentage rule. Actual tax obligations depend on jurisdiction and personal details, and this page does not attempt to compute what you owe. If you need a real estimate, talk to a qualified tax professional.

What should I use as gross monthly income?

Use a best-effort estimate of what you will bring in for the month, before taxes. If your income is irregular, use a rolling average or use the per-payment approach and treat the monthly number as a planning check rather than a promise.

Do I set aside on revenue or profit?

The calculator is based on gross income because it is fast and easy to apply. Some people prefer to plan on a number that accounts for expenses. Either approach can work as a planning habit as long as you are consistent and you understand that this is not a legal or tax determination.

What if my expenses are high in some months?

High-expense months are a strong argument for a per-payment set-aside habit. When money comes in, you set aside first. Then you decide which expenses to pay from what remains. If you only set aside at month end, it is easy to spend the cash and realize too late that the bucket is empty.

What if I have multiple clients and uneven payments?

Treat each payment the same. The moment a payment clears, apply the same set-aside percentage and move that amount into the bucket. This avoids the mental overhead of deciding which client payments "count" and which do not.

How often should I change my percentage?

Avoid changing it weekly. If you change the number constantly, the habit becomes a negotiation. Instead, pick a default and review it on a schedule. For many people, that review happens after they have a cleaner quarter of bookkeeping or after a conversation with their accountant.

What if I cannot afford to set aside that much right now?

If set-aside feels impossible, it is often a sign of a cashflow problem rather than a discipline problem. You might be underpricing, you might have late-paying clients, or your expenses might be out of alignment with your current revenue. In that situation, set-aside is still useful because it reveals the gap, but you may need to fix the underlying system.

Does this tool store my numbers?

If you are thinking about privacy, that is a good instinct. Read the privacy page for details on data handling and what information may be collected when you use the site.

Privacy

Tax planning touches sensitive information. Even if you are only working with estimates, it is reasonable to care about what happens to the numbers you type into a tool.

For the details that matter (data collection, analytics, and retention), read the Privacy policy.

How to customize

1. Pick a conservative percentage for your jurisdiction and situation.
2. Adjust once you have a baseline after a quarter or two.

Related Codex pages