The Cash Setup Most High Earners Get Wrong (And How to Fix It)

Cash management for high earners is often messier than it should be. I see entrepreneurs, tech workers, and business owners with far too much sitting in checking, and others who keep checking so lean that they are constantly moving money just to pay a credit card bill.

This article covers a simple framework: how much cash to hold, how to split it between checking and investment cash, and how to choose where that investment cash sits based on after tax yield.

How much cash should you hold?

Most cash confusion comes from mixing different purposes together. I define 3 amounts separately and then add them up.

• Goal cash. Money you know you will need within roughly 12 months for things like taxes, tuition, a home project, a real estate purchase, or a business investment. If you cannot afford market volatility on it, it typically belongs in cash or something cash like.
• Safety cash. Your emergency fund, sized to your own risk.
• Convenience cushion. An amount that simply makes life easy, so you are not thinking about cash flow timing every week. For many people this is about 1 extra month of spending.

How big should your emergency fund be?

The common rule of 3 to 6 months of expenses is a fine baseline. For high earners and business owners I prefer a risk based approach that looks at income stability, fixed monthly obligations, how quickly you could cut spending, and complexity such as a business, rentals, or unpredictable taxes. The ranges tend to look like this:

• Stable W2 income and lower fixed costs: about 3 to 6 months of core expenses.
• High but volatile compensation (tech equity, commissions, bonuses): about 6 to 12 months.
• Business owners, multiple properties, or high fixed costs: about 9 to 18 months, sometimes more depending on the business.

How much to keep in your checking account

I like a two tier system. Tier 1 is checking, which is operating cash for bills, spending, and autopay. Checking should be boring, and you are not trying to squeeze yield out of it.

To set the balance, add up your recurring monthly outflows and then add a cushion so you never have to babysit timing. For a lot of high earners that works out to 1 month of spending, or a minimum balance that keeps the system frictionless. If you are transferring money into checking multiple times a month, your system is too tight.

Where to keep the rest of your cash

Everything above Tier 1 is Tier 2, which I call investment cash. It includes your safety cash, near term goal cash, and any extra liquidity you want. The aim is to keep it safe, liquid, and earning a competitive return after taxes.

The biggest mistake I see here is chasing the highest headline yield and ignoring taxes. A 5% yield in a high bracket in a high tax state is not 5% in your pocket. Comparing options by tax equivalent yield puts them on the same footing, and there are simple calculators online for it.

Money market funds, Treasury funds, and municipal funds compared

• Fully taxable money market funds or high yield savings accounts. Simple, liquid, and competitive. Interest is generally taxed at your federal ordinary income rate and often your state rate too. This is a reasonable baseline for lower brackets, states with no income tax, or anyone who values simplicity over optimization.
• Treasury focused money market funds. US Treasury interest is generally exempt from state and local income tax, though the exempt share varies with what the fund holds. You may still owe federal tax. These tend to fit high earners in high tax states.
• Municipal money market funds or short term municipal bond funds. Municipal interest is often exempt from federal income tax, and a fund focused on your home state may also be exempt from state tax. The tradeoffs are credit risk compared to Treasuries, some price movement in bond funds, and special tax rules in some cases.

The right choice depends on your marginal federal bracket, your state, and how much liquidity you need. A stated yield can look lower and still leave you with more after tax.

Common questions

How much cash should a high earner keep?

Add up goal cash for known needs in the next 12 months, safety cash sized to your risk, and a convenience cushion of about 1 month of spending.

How much should I keep in my checking account?

Enough to cover your recurring monthly outflows plus a cushion. For a lot of high earners that is about 1 month of spending.

Are Treasury money market funds exempt from state income tax?

US Treasury interest is generally exempt from state and local income tax. Funds hold different mixes, so the exempt percentage varies, and funds typically report it.

VDB Wealth is a registered investment adviser. Information presented is for educational purposes only and is not intended to make an offer or solicitation for the sale or purchase of any specific securities, investments, or investment strategies. Investments involve risk and, unless otherwise stated, are not guaranteed. Past performance is not indicative of future performance.

If you’re a high earner, entrepreneur, tech worker, business owner, there’s a weird thing that happens.

You’re successful, you’re saving money… and yet your cash setup is often a complete mess.

Either you have way too much sitting in checking doing nothing…

or you keep it lean and you’re constantly transferring money around like you’re managing a small hedge fund just to pay your credit card bill.

And the frustrating part is: cash management is one of the simplest upgrades you can make to your financial life.

Not because it’s flashy.

Because it reduces stress, it saves time, and it quietly improves your results, especially after taxes.

So today I’m going to walk you through a simple framework:

1. How to decide how much cash to hold versus invest, based on goals, timelines, income stability, and the “sleep at night” factor.

2. How to structure that cash using a simple two tier system: checking versus investment cash.

3. And then: how to choose the right “investment cash” options based on after tax yield, which changes depending on your tax bracket and where you live.

Quick disclaimer: this is educational, not personal financial advice.

Why cash deserves more attention

Most people think cash is just… cash.

But cash actually has value in a few different ways:

It buys you flexibility. It buys you time. It buys you peace of mind. And it prevents you from making dumb decisions when markets are volatile.

Cash doesn’t make you rich.

But the right cash system makes everything else in your financial life work better.

So let’s start with the most important question.

How much cash should you hold?

Cash has three jobs. If you get these right, the rest becomes pretty straightforward.

Job #1: Spending cash. This is the money that runs your life: bills, mortgage, childcare, credit cards, payroll, quarterly taxes, the recurring stuff.

Job #2: Safety cash. This is your buffer. Emergency fund. The “life happens” category.

Job #3: Goal cash. This is money you know you’ll need for a specific purpose in the near to medium term: a tax payment, down payment, tuition, a renovation, a business investment, whatever.

Most cash confusion comes from mixing these together.

So we’re going to define them separately, then add them up.

Identify your “goal cash”

The easiest place to start is goal cash, cash you know you’ll need.

Ask: In the next 3 to 12 months, what large payments are basically locked in? Taxes? Tuition? A home project? A real estate purchase? A business investment? A planned charitable gift?

Here’s a simple rule of thumb:

If you need the money within roughly 12 months, and you truly can’t afford market volatility, that money is typically cash or cash like, not long term investments.

There are exceptions, but this is a great starting point.

Determine your “safety cash” using a risk based approach

Now the part everyone argues about: emergency funds.

The internet loves “3 to 6 months of expenses.”

That’s fine for a baseline.

But for high earners and business owners, I prefer a risk based approach, because your life doesn’t fit into a generic rule.

Here are the variables that actually matter:

1) Income stability. Stable W2 with high job security? You can generally keep the floor lower. Commission heavy, bonus heavy, or tech comp tied to equity? You probably want more. Founder income that’s lumpy? You almost always want more.

2) Fixed monthly obligations. If your monthly nut is big, mortgage, kids, tuition, multiple properties, you want more runway.

3) Flexibility. How quickly can you cut spending if you had to? Some people can move fast; others are locked in.

4) Complexity. Business owners, rentals, unpredictable taxes, complexity increases the value of liquidity.

So the “right” safety cash level tends to land in ranges like:

Stable W2 + lower fixed costs: ~3 to 6 months of core expenses.

High comp but volatile (tech/commission/bonus heavy): ~6 to 12 months.

Business owner / multiple properties / high fixed costs: ~9 to 18 months, sometimes more depending on the business.

The key is: don’t pick a number because the internet told you to.

Pick a number that fits your personal risk profile.

The underrated category, the “convenience cushion”

Now I want to talk about something that sounds small but honestly matters a lot:

The convenience cushion.

Separate from emergency funds, there’s a cash amount that simply makes life easy.

Because constantly transferring money to checking is annoying.

And if you’re busy, running a business, managing a team, traveling, you don’t want to be thinking about cash flow timing every week.

So I like having a built in cushion that prevents: “Oh wait, the credit card hits tomorrow.” “Hold on, I need to move money.” “Why is this autopay bouncing?” “Did that tax payment clear?”

It’s not about maximizing yield here. It’s about maximizing time and ease.

For many people, this convenience cushion is basically: about one extra month of spending, or a baseline checking balance that avoids micromanagement.

Quick recap

So when someone asks, “How much cash should I hold?” I’m really asking you to add up:

1. Goal cash (known near term needs)

2. Safety cash (risk based emergency runway)

3. Convenience cushion (so your system runs smoothly)

Once you know that total cash number, the next question becomes:

Where should it live?

Two tier structure: checking vs investment cash

Here’s the setup I like because it’s simple and it actually works:

Tier 1: Checking. This is operating cash, bills, spending, autopay, life.

Tier 2: Investment Cash. This is the rest of your cash, still safe and liquid, but earning a competitive after tax return.

That’s it. Two tiers.

How much should be in Tier 1 checking?

Checking should be boring. You’re not trying to squeeze yield here.

A practical way to set it:

1. Add up your recurring monthly outflows, mortgage, childcare, utilities, insurance, credit cards, payroll, taxes, whatever applies.

2. Add a cushion so you never have to babysit timing.

For a lot of high earners, that’s either: one month of spending, or a minimum checking balance that makes the system frictionless.

And here’s a rule I love:

If you’re transferring money into checking multiple times a month, your system is too tight.

The goal is a setup that’s automated, boring, and doesn’t steal your attention.

Tier 2: what “investment cash” means

Once you set Tier 1, everything above it becomes investment cash.

Investment cash is money you want to keep: safe, liquid, and earning a real return, especially after taxes.

This is where money market funds, Treasury focused options, and municipal options come into play.

And this is where most high earners make the biggest mistake:

They chase the highest headline yield… and ignore taxes.

So let’s fix that.

After tax yield & the 3 main “investment cash” options

At this tier, the goal isn’t the highest yield.

It’s the highest after tax yield.

Because a 5% yield in a high bracket in a high tax state is not actually 5% in your pocket.

So we want to compare options apples to apples using tax equivalent yield.

There are calculators online for this. I like the Bankrate tax equivalent yield calculator because it’s simple, you plug in your tax rate and compare taxable yields to tax advantaged yields.

Now let’s break down the three big buckets of “investment cash” options:

1. Fully taxable money market funds

2. Treasury / state tax advantaged money market funds

3. Municipal options that can be federally tax free, and sometimes state tax free

Fully taxable money market funds (or HYSA)

Option one: fully taxable money market funds, and in the same general category, high yield savings accounts.

Why people like them: simple, liquid, competitive yields, easy default choice.

The tax piece: Interest is generally taxed at your federal ordinary income rate, and often your state income tax rate too.

Who it’s best for: people in lower brackets, people in no state tax states, or anyone prioritizing simplicity over optimization.

This is a totally reasonable baseline.

But if you’re a high earner in a high tax state, we should at least look at the next option.

Treasury focused money market funds (state tax advantage)

Option two: Treasury focused money market funds.

These are cash like funds that hold a lot of U.S. Treasury exposure.

The big benefit: U.S. Treasury interest is generally exempt from state and local income tax.

Now, nuance: funds can hold different mixes, Treasuries, repos, other short term instruments, so the exact percentage that’s state tax exempt can vary. Funds typically report this.

But conceptually:

You may still owe federal tax, but you can reduce or avoid state tax on the interest.

Who it’s best for: high earners in high tax states, where state tax meaningfully reduces your net yield.

So even if the headline yield looks slightly lower than a fully taxable option, you might keep more after tax.

Municipal options (federal tax free, sometimes state tax free)

Option three: municipal money market funds.

This usually shows up in two forms: municipal money market funds (more cash like), or short term municipal bond funds (still conservative, but can fluctuate more).

Why people use them: Municipal interest is often exempt from federal income tax.

And if you use a fund focused on your home state, it may also be exempt from state income tax.

Tradeoffs to understand: munis have credit risk compared to Treasuries, municipal bond funds can have some price movement, and certain municipal interest can have special tax rules in some cases.

But for the right person, high bracket, especially in a high tax state, munis can be extremely compelling on an after tax basis.

That’s why tax equivalent yield calculators are helpful: the stated yield can look lower, but the after tax yield can be great.

Quick cheat sheet: which one tends to fit who?

Here’s the simple cheat sheet:

If you want simplest and you’re not in a high bracket: taxable money market / HYSA is usually fine.

If you’re a high earner and you pay meaningful state income tax: look at Treasury focused money market funds for the state tax benefit.

If you’re in a very high bracket, especially in a high tax state: compare Treasury options vs municipal options using after tax or tax equivalent yield.

And the right answer depends on: your marginal federal bracket, your state, and how much liquidity you actually need.

Putting it all together

So here’s how I’d implement this in a clean, non annoying way:

Step 1: Set Tier 1 checking. Monthly outflows + cushion so you’re not transferring money all the time.

Step 2: Everything else becomes Tier 2 investment cash. This includes: your safety cash, your goal cash (if near term), and any extra liquidity you want.

Step 3: Optimize Tier 2 by after tax yield. Compare: taxable money market, Treasury focused money market, municipal options using tax equivalent yield.

You’ll end up with a system that’s: stable, simple, tax aware, and doesn’t require you to think about it every week.

If you want help building a simple “cash map” like this, how much goes where, what to automate, and which cash vehicles make sense based on your goals, timeline, and taxes, that’s something we do at VDB Wealth.

Not just investments. The whole system.

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