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Vanguard UPDATE: The Most Accurate Roth Conversion Strategy You’ve Never Been Taught

Erin Talks Money | Erin Moriarity

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This video breaks down the most accurate Roth conversion strategy using Vanguard’s new Break-Even Tax Rate (BETR) research — a game-changing framework for retirement tax planning and long-term wealth management. Most investors compare today’s tax bracket to their future tax bracket, but Vanguard’s BETR analysis reveals a smarter, more precise way to decide whether a Roth conversion will increase your after-tax wealth.

You’ll learn the ONE rule that truly matters, plus three hidden factors that influence Roth conversions far more than your future tax rate: tax-payment sourcing, IRA basis, and unlocking backdoor Roth contributions. This step-by-step guide helps investors optimize retirement income, reduce lifetime taxes, and improve long-term portfolio efficiency.

If you want to make informed decisions about Roth conversions, tax-efficient investing, and retirement withdrawal strategies, this video gives you a clear, data-driven roadmap backed by Vanguard research.

00:00 Intro:Why Roth Conversion Decisions Are Often Framed Wrong
00:27 What Most People THINK a Roth Conversion Decision Is
02:04 BETR Explained:The Roth Conversion Rule Almost Everyone Forgets
03:01 Why BETR Changes the Entire Roth Conversion Decision
03:57 The Jill Example:When the Roth Conversion Math Finally Clicks
08:18 The 3 Hidden Factors That Matter More Than Your Future Tax Rate
09:09 Factor #1:Where the Money Comes From to Pay Roth Conversion Taxes
09:32 Option 1:Paying Roth Conversion Taxes From the IRA Itself
10:09 Option 2:Paying Taxes From a Tax-Efficient Taxable Account
10:54 Option 3:Paying Taxes From a Tax-Inefficient Taxable Account
11:46 Option 4:Paying Roth Conversion Taxes From Cash
12:48 Factor #2:Your Nontaxable Basis (Pro-Rata Rule Explained)
13:36 Scenario 1:Income Too High for a Deductible IRA Contribution
14:09 Scenario 2:Intentional Nondeductible IRA Contributions
15:47 Factor #3:When Roth Conversions Unlock Backdoor Roth Contributions
16:46 How Roth Conversions or IRA-to-401(k) Rollovers Clear the Deck
16:50 Option 1:Do a Roth Conversion Now
17:05 Option 2:Roll a Pre-Tax IRA Into a 401(k)
17:28 Vanguard Research:Quantifying the Long-Term Impact of Roth Conversions
19:28 Roth Conversion Decision Framework Summary
19:58 How to Apply BETR in Real-World Roth Conversion Decisions
22:12 Bloopers

Source:
https://corporate.vanguard.com/conten...

Vanguard Roth Conversion Calculator: https://advisors.vanguard.com/tax-cen...

Some of my favorite books: https://amzn.to/3KF3tlr
Camera & equipment I use: https://amzn.to/3Z20lof

Disclaimer: Please note that this video is made for entertainment purposes only and not to be taken as financial advice. Always make sure to do your own research.

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20 Comments

@Davidarth123 9 months ago

Why does Jill’s IRA tripple in 20 years but her after tax investment only double in same time period?

@TheInvestingCanvas 8 months ago

roth conversions are the ultimate hedge against future tax hikes. thanks for the deep dive on this

@michaelroman4076 9 months ago

Erin, I’ve seen LOTS of videos on Roth, Roth conversions, and Backdoor Roth. This is the best and most actionable I have ever seen. At one point, it looked like you left out the pro rata rule, as so many content creators do … then you came back to it. I value your comprehensiveness. This video is so simple, so elegant, so well laid out. And, btw, you sharing the math is among the best part of it.

@joeretired4552 1 month ago (edited)

Your opening remarks are spot on concerning current taxes versus future taxes. RMDs are just beginning to impact my taxable income and taxes are rising… and IRMAA and Medicare costs are looming.

@Yankindc 9 months ago

I learned a lot from this video. For married people filing jointly, another factor to keep in mind for conversions is how tax brackets would shift when there is one surviving spouse, now filing single.

@RobinMudd 9 months ago

Same here. I didn't get any financial education growing up. I started at 45, overwhelmed and embarrassed. Two years later, I'm finally debt-free after paying off $176k. My net worth “ isn't crazy, but it's stable - around $880k. And honestly, that stability feels like a blessing.

@TheZippyCrew 9 months ago

This one made my head hurt.

@JJAdvice1 8 months ago

I have been a CPA for 40 years and I wanted to let you know I found your presentation excellent, you are right to the point and pleasant to listen to.Keep up the great work educating with practical useful information

@JanetAllan-cd1zs 9 months ago

Erin, once again you've outdone yourself. This is the first time I've heard about this BETR. I've been listening to videos from a number of financial experts for over a year and you are the first to mention this. Thanks for bringing us all the content we need to make informed decisions.

@roderick.t 9 months ago

Woooo, there's a lot here. I'll have to re-watch this video a few more times.

@takeitasacompliment. 9 months ago

Things change all right. I am 95% rollover IRA. My $2.5M balance I did not pay MI state income tax rate of 4.25%. A couple years back. MI decided to phase out State income tax on Social Security and IRA withdrawals.

@Gungho70 9 months ago

She puts out videos at a relentless rate, like 1 a day. High energy!

@Riffman42 9 months ago

Something that hardly ever gets mentioned in these Roth discussions is that those Roth dollars can be used as income that doesn't count against your MAGI which is important if you're under 65 and using the ACA for healthcare. In this case, it's not just about the BETR.

@DK-pr9ny 8 months ago

The best Roth conversion video I’ve watched. Well done, Erin!

@hoqiez 9 months ago

I was always one of the only people who enjoyed reading my textbooks in college- now I know why I love your channel! I’m always building my own models and running scenarios. So often I later find a video of yours validating a hunch I’ve had or giving me new things to research.

@judyjohnson1012 5 months ago

This is a lot to comprehend! I will have to watch it again to get real meaning.

@isthisreallyamerica 9 months ago

Former CPA and COO. Your show is my favorite financial planning show. Great content and I’m confident depending on the episode that you either know the topic thoroughly or you have done your homework. Great job Erin.

@MrMiniPilote 9 months ago

You really nailed it on this one from my perspective. Everyone saying to pay the conversion taxes with my investment account seemed off, now I can see why. Thanks again for the content.

@dgun6924 9 months ago

Great video! You are a true blessing to everyone working to educate themselves and become more financially literate. Your videos are so pithy and concise, making them a golden value. Typically, I only watch videos less than 12 minutes, yours however, aren't in my limit category. Always so educational. Thank you.

@vaderwashere365 9 months ago (edited)

Wow, this is pretty game changing. We are just in that 37% tax bracket and never really thought about converting our traditional 401K balances. We put more into our Megabackdoor and IRA + convert to Roth than our already maxed traditional 401Ks these days to hedge Roth with Traditional, but super good to know a new method to see if converting will benefit us still. This BETR seems to imply that even if you expect a lower tax rate in retirement, doing Roth 401K contributions (instead of traditional) might still make sense in the highest tax brackets - which I never fathomed.