Where Should Your Extra Savings Go?

A research-informed order of operations for cash reserves, debt, retirement accounts, brokerage accounts, 529s, and mortgage prepayment.

The hard part of having extra savings is rarely finding a good option. It’s choosing between several.

In Episode 33 of The Decision Dividend, Pat Collins and Marcus Schafer walk through a practical order of operations to decide where your extra savings should go. The answer is not always the account with the best theoretical return. The right sequence depends on cash flow, liquidity, taxes, debt, goals, and behavior.

You’ll learn:

How to avoid the high-income paycheck-to-paycheck trap by setting a savings target before lifestyle absorbs the next raise

Which dollars often deserve early consideration: emergency cash, high-interest debt, and employer-provided matching opportunities

What research says about the harder tradeoffs, including Roth vs. pre-tax, taxable brokerage vs. 529s, and extra mortgage payments vs. investing

Chapters

00:00 Where Should Your Extra Savings Go?
Why the next-dollar decision is really a tradeoff between several good options.

01:34 Tightwads, Spendthrifts, and the Pain of Paying (1)
How different people experience spending and saving differently, and why behavior matters before optimization.

02:40 Savings Rate Comes First (2)
Why the most powerful planning variable is often not Roth vs. pre-tax, but whether lifestyle absorbs the next raise.

07:09 Make the Plan Automatic (3, 4, 5)
Why defaults, payroll deductions, and automation often matter more than a perfectly designed spreadsheet.

13:35 The Savings Waterfall
A practical starting point: create margin, build emergency reserves, avoid high-interest debt, and capture employer-provided matching opportunities.

16:40 Liquidity, Taxes, and Account Flexibility
Why the same dollar feels different in cash, taxable brokerage, pre-tax retirement accounts, and Roth accounts.

20:26 Taxable Brokerage vs. Retirement Accounts
How tax drag, liquidity, goal timing, and future uncertainty shape where the next dollar should go.

28:00 Roth vs. Pre-Tax Is Not a Religion (6, 7)
Age + 20% is a good rule of thumb but current tax rates, future tax rates, tax uncertainty, and account access make this decision highly personal.

31:20 Mortgage Prepayment vs. Investing (8)
How to compare the guaranteed return of paying down debt against the double tax and return benefits of retirement investing.

38:59 The Theory Only Works If You Actually Do It (3, 4, 5, 8)
Why behavior can erase the benefits of a more optimal strategy if the money never actually gets invested.

43:10 College Savings, 529s, and Optionality (9)
Why education funding should be balanced against retirement, flexibility, and uncertainty about future college costs.

52:48 Build a Repeatable System
Why rules of thumb can help, but personalized advice matters when cash flow, taxes, debt, goals, and behavior collide.

Sources

1. Scott I. Rick, Cynthia E. Cryder, and George Loewenstein, “Tightwads and Spendthrifts,” Journal of Consumer Research, 2008. https://academic.oup.com/jcr/article-abstract/34/6/767/1795103
2. Goldman Sachs Asset Management, Retirement Survey & Insights Report 2025. https://am.gs.com/en-us/advisors/insights/report-survey/retirement-survey
3. Brigitte C. Madrian and Dennis F. Shea, “The Power of Suggestion: Inertia in 401(k) Participation and Savings Behavior.” https://www.nber.org/system/files/working_papers/w7682/w7682.pdf
4. Richard H. Thaler and Shlomo Benartzi, “Save More Tomorrow: Using Behavioral Economics to Increase Employee Saving.” https://www.anderson.ucla.edu/documents/areas/fac/accounting/smartjpe226.pdf
5. Raj Chetty, John N. Friedman, Søren Leth-Petersen, Torben Heien Nielsen, and Tore Olsen, “Active vs. Passive Decisions and Crowd-Out in Retirement Savings Accounts.” https://eml.berkeley.edu/~saez/course/chettyatQJE14savings.pdf
6. David C. Brown, Scott Cederburg, and Michael S. O’Doherty, “Tax Uncertainty and Retirement Savings Diversification.” https://www.sciencedirect.com/science/article/pii/S0304405X17302519
7. Wall Street Journal, “Why So Many People Get Financial Advice That Is Wrong for Them.” https://www.wsj.com/finance/investing/financial-advice-investments-personalization-fea73e95
8. Gene Amromin, Jennifer Huang, and Clemens Sialm, “The Tradeoff Between Mortgage Prepayments and Tax-Deferred Retirement Savings.” https://www.nber.org/papers/w12502
9. Fidelity, “Understanding 529 Rollovers to a Roth IRA.” https://www.fidelity.com/learning-center/personal-finance/529-rollover-to-roth

 

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Information contained herein has been obtained from sources considered reliable, but its accuracy and completeness are not guaranteed. It is not intended as the primary basis for financial planning or investment decisions and should not be construed as advice meeting the particular investment needs of any investor. This material has been prepared for information purposes only and is not a solicitation or an offer to buy any security or instrument or to participate in any trading strategy. Past performance is no guarantee of future results.