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Investing on variable income

Investing when your income fluctuates takes more planning than automatic payroll deductions. You need a system that funds retirement accounts consistently, handles variable contribution amounts, and allocates excess income from strong quarters without disrupting your cash flow. The guides here cover the investment decisions most relevant to commission-based reps.

Order of operations

The sequence in which to deploy income for investment: employer 401k match first (free money), then Roth IRA, then additional 401k contributions, then taxable brokerage. Following this sequence in order captures the highest-value options before moving to the next layer.

Backdoor Roth IRA

A strategy for contributing to a Roth IRA when income exceeds the direct contribution limit. The process involves making a non-deductible traditional IRA contribution and then converting it to a Roth. This is relevant for sales reps who hit strong years and otherwise lose Roth access.

Concentration risk

The risk that comes from having too much of your net worth tied to a single company's stock. This is a real issue for tech sales reps with significant equity comp in their employer. A financial plan accounts for when and how to diversify out of concentrated positions.

Planning income

The conservative income figure used to determine sustainable investment rates: base salary plus 50% of typical commission. Every dollar above that figure is treated as upside to deploy toward goals -- not as a new baseline for spending or contributions.

Budgeting
How to Budget on Commission Income

The reserve bucket system for smoothing variable pay -- the same system that makes consistent investing possible on lumpy income.

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Financial Planning
How to Build an Emergency Fund on Commission Income

The emergency fund is the foundation beneath every investment strategy. How to size and build it correctly before directing money to markets.

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Equity Compensation
ISO vs RSU: Which Equity Compensation Is Better?

Tax treatment and timing comparison. Equity comp is a separate investment layer that requires its own strategy.

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Equity Compensation
When to Exercise ISO Stock Options

AMT, timing strategy, and pre-IPO considerations. When you exercise determines your investment cost basis and your tax bill.

11 min read Read →
Should a sales rep prioritize a Roth IRA or a 401k?

For most sales reps, the right order is: contribute enough to the 401k to capture the full employer match, then max the Roth IRA ($7,500 in 2026 if under 50), then go back and increase 401k contributions. The Roth IRA gets priority because it offers tax-free growth and withdrawals, and the income ceiling makes it unavailable at higher income levels.

How do you invest consistently when income varies?

The income smoothing system solves this. All income flows into a reserve account first. A consistent monthly transfer goes to your checking account. Investment contributions are automated from that consistent amount -- so they happen every month regardless of what the commission schedule looked like that quarter.

What should you do with a large commission check?

Set aside the tax shortfall first. Then follow the order of operations: top off the income reserve, max retirement contributions if not already done, fund any specific savings goals, then direct the remainder to a taxable brokerage account. Having this decision mapped out in advance means you're not making financial decisions with a large number sitting in your checking account.

How much should a sales rep invest?

The target is 20 to 25% of planning income, which is base salary plus 50% of typical commission. This conservative baseline keeps contributions sustainable in slow years. Strong quarters provide the opportunity to contribute more on top of the baseline.

What is the difference between a brokerage account and a retirement account?

Retirement accounts (401k, Roth IRA) offer tax advantages but have contribution limits and withdrawal restrictions. Brokerage accounts have no contribution limits, no withdrawal restrictions, and no tax advantages on the account level. For sales reps who max retirement accounts and have additional income, a taxable brokerage account is the next layer.

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