When does it make sense to borrow instead of sell?
When most of your wealth is invested or illiquid, how you raise cash matters as much as how you invest. Selling isn't always the cheapest option.
There's a version of financial advice where debt is simply bad and the goal is to have none. That's a reasonable default for someone with high interest consumer debt and not much else.
It's the wrong frame for a household whose wealth sits in appreciated investments, a business, or real estate. There the question isn't whether to borrow. It's which source of cash costs least, all in, including tax.
The short answer. Selling an appreciated asset has a tax cost that doesn't appear on the statement. Once you count the capital gain, plus what that income does to your bracket and your Medicare premium, borrowing is sometimes cheaper for a short term need. Sometimes it isn't. The comparison is worth doing rather than assuming.
| Selling the asset | Borrowing against it | |
|---|---|---|
| Immediate cost | Capital gains tax on the growth | Interest, for as long as the loan runs |
| Knock-on effects | Bracket, Social Security taxability, Medicare premium two years later | None of those |
| The asset afterwards | Gone, along with its future growth | Still yours, still invested, still pledged |
| Main risk | Selling at a bad moment because you had to | A collateral call in a decline, forcing the sale anyway |
| Fits best | A permanent need, or an asset you wanted to reduce | A short term need against a large embedded gain |
Cash is a separate question from investing.
Most people think about their portfolio and their cash as one topic. They're two.
The portfolio's job is long term growth. Cash has a different and specific job: making sure you never have to sell a good asset at a bad moment. Those requirements conflict, which is why the answer is a deliberate amount rather than whatever happens to be left over.
How much depends on your situation rather than a rule of thumb. Steady employment income and no near term obligations means less. A business owner with variable income, or a retiree drawing from the portfolio, means more. Anyone with a known large expense inside two years should have it set aside already rather than invested.
The version we use most: a year of must-spend held in cash for anyone drawing income, plus anything earmarked for a specific purpose within about 24 months. See how much do you actually spend.
When borrowing beats selling.
Selling an appreciated asset has a cost that doesn't show on the statement. There's the capital gains tax. Then there's what that extra income does to your bracket, the net investment income tax, your Medicare premium, and how much of your Social Security gets taxed.
Once you account for that, borrowing is sometimes cheaper.
Borrowing usually wins when:
- The need is short term and you already know what repays it
- The embedded gain is large
- It's an asset you'd want to keep anyway
- Selling would push you across a tax line in a year you were managing carefully
Selling usually wins when:
- The position was overweight anyway
- You have losses available to offset the gain
- The borrowing rate is above what the asset can reasonably earn
- The need isn't short term
Borrowing against a portfolio, with the risk stated.
A line of credit secured by a taxable portfolio can be arranged quickly, at rates that are often competitive, without selling anything or triggering a gain. Both Schwab and Pershing offer facilities of this kind.
The advantages are genuine. So is the risk, and it belongs in the main text rather than a footnote.
If the collateral falls in value, you can be required to post more or repay on short notice. That demand tends to arrive precisely when markets are down and selling is least attractive. Rates are usually variable.
Used for a defined short term need, with a clear repayment plan and conservative borrowing against the portfolio's value, it's a useful tool. Used to fund ongoing spending, or borrowed against aggressively, it turns a market decline into a forced sale, which is the exact outcome the portfolio was designed to avoid.
Mortgages for people who don't need one.
The question we're asked most here is whether to pay off a mortgage early, and the honest answer is that it's rarely the numbers that decide it.
The arithmetic compares your after tax borrowing cost against what the money would otherwise earn, and for many households those figures are close enough that either choice is defensible. Which means the decision comes down to what the debt does to you. Some people sleep better without it, and that's a real return. Others would rather keep the liquidity, which is also a real return.
Two things do change the arithmetic. Paying off a mortgage requires liquidating assets, which has a tax cost worth calculating first. And a paid off house is illiquid: the equity is only accessible by borrowing against it or selling it, usually on someone else's timetable.
For business owners, the picture is different again.
If you own a company, your personal and business balance sheets are connected whether you've formalised it or not. Personal guarantees, a home pledged as collateral, and a business line that constrains distributions all reach into your personal plan.
The pattern worth watching is concentration. A business owner frequently has the business as their largest asset, their income source, and the collateral behind their borrowing at the same time. That's three exposures to one outcome. There's more on unwinding that in what to do when one stock is too much of your portfolio.
Nothing here sits on its own.
A liquidity decision looks like a banking question. It's a tax question, an investment question, and sometimes an estate question, because how you raise cash changes your bracket, your holdings, and what's left to pass on.
Cosmos Wealth doesn't originate loans and receives no compensation from any lender. We look at the whole balance sheet, including the liabilities, and coordinate with your lender when something needs to change. Seeing all of it together rather than one account at a time is a large part of how we work.
If a liquidity decision is coming up, let's talk before rather than after.
Common questions.
- When does borrowing beat selling an investment?
- When the need is short term and the asset carries a large embedded gain. Selling triggers a capital gain, and that income also moves your bracket, the taxable portion of your Social Security, and your Medicare premium two years later. Borrowing has an interest cost but triggers none of that. Sometimes borrowing wins, sometimes it does not, and the comparison is worth doing rather than assuming.
- What is the actual risk in borrowing against a portfolio?
- Not the rate. It is the collateral requirement. If the portfolio falls, the lender can require you to post more collateral or repay, and that demand arrives precisely when selling is worst. A line that looks conservative against a calm market can become a forced sale in a bad one, which is why the sizing has to assume a decline rather than hope against one.
- How much cash should we hold?
- Enough that a market decline never forces a decision, which is a different question from what earns the most. Cash is not an investment decision at all; it is the thing that stops you having to make an investment decision at the worst moment. How much depends on your spending, not on a rule of thumb.
- Does a mortgage make sense if we could pay cash?
- Sometimes, and the reason is rarely the interest rate on its own. Paying cash means liquidating assets, with the tax that follows, and leaves the money in the house rather than available. A mortgage keeps liquidity and keeps the assets invested. Whether that trade is worth the interest depends on your rate, your bracket, and how much liquidity you already hold.
- Is it different for business owners?
- Yes, because the business is usually both the largest asset and the source of income, and lenders may want personal guarantees against it. Borrowing personally and borrowing through the business have different consequences, and the two decisions are easier to get wrong when they are made separately.
