![3499: [Part 1] How to Model the Retirement Income Gap by Darrow Kirkpatrick of Can I Retire Yet — Optimal Finance Daily - Financial Independence and Money Advice cover](https://megaphone.imgix.net/podcasts/e652f8a8-18a1-11f1-aebf-9fcf7c27f371/image/2323a782d8af6a62f6f7f75f7d095220.jpg?ixlib=rails-4.3.1&max-w=3000&max-h=3000&fit=crop&auto=format,compress)
Darrow Kirkpatrick explains that the traditional idea of retirement, working steadily until benefits begin, is often unrealistic for modern retirees
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This is Optimal Finance Daily how to Model the Retirement income gap part one by Darrell Kirkpatrick of caniretireyet.com the textbook or fairytale version of retirement goes something like this. You work your entire career until you save your retirement number or reach the pension or Social Security age around 65 later. For many boomers, then your paycheck stops and your retirement income starts. This is a convenient fiction for discussing retirement in sound bite sized chunks. The only problem is that it isn't realistic. For many of us, that textbook version of retirement features a relatively steady and predictable cash flow. 1. You collect a paycheck for 30 to 40 years and then 2 you collect pension, Social Security, or annuity checks for the rest of your life. Unfortunately, the reality is that many of us in the boomer generation and succeeding Generation X and Y won't experience that steady fairy tale flow of income in retirement. Here are just three of the possible reasons why you may get laid off or retire early before a pension or Social Security starts. 2. You may decide to defer Social Security in order to increase your lifetime benefits and number three, you may have a spouse who retires on a different schedule with benefits starting at a later date. If your situation resembles any of these, then your retirement equation is a bit more complex than the often recommended save some multiple of your expenses model. Simply subtracting your guaranteed income from your expenses to see if you have enough savings to cover the shortfall doesn't cut it since your income will change during retirement. If you're serious about modeling and understanding your cash flow in retirement, knowing if you'll have enough, how do you handle this kind of retirement income gap? Is there really a single retirement number you can compute in this case. First, the bad news. This is going to require some math or some software tools, and probably a bit of both. Or you could pay a financial planner to answer the question for you. However, I'd encourage you to try it yourself first, because the good news is that it's relatively simple. And by taking ownership of your own retirement model, you'll be in the driver's seat when inevitable changes happen and questions arise. You'll be able to tweak the inputs and answer those questions quickly at home. You won't have to find, schedule, communicate with, and pay a professional just to understand your financial future. So let's get started. There are two fundamental ways that I know how to look at this problem of uneven income in retirement. Cash flow and present value. Mathematically, they're equivalent. One is not superior to the other, but they do require different tools and one lends itself better to a detailed analysis while the other is better as a rough estimate. If possible, use both at the start. That way you can double check your own situation and also form your own preference between the two. That's what I did. Cash Flow this is the easiest technique to understand, but the hardest to perform without some software support. Essentially, it's no different than balancing a checkbook, but on a longer time scale. So you start with your current savings, then for each year of the rest of your life, you simply add in your income and subtract out your expenses for greater accuracy. You must also add in investment returns for each year, while adjusting your expenses for possible inflation and taking out taxes. The main benefits of this approach are that it's simple to understand in theory, and it provides a comprehensive view of your financial life. For each year you get a detailed snapshot of your financial position, seeing all the inflows and outflows. And this approach can naturally handle an infinite variety of future events. Your spouse has switched to part time work in three years, the new car you expect to buy six years from now, the start of your delayed Social Security benefits in eight years, for example. The main drawback to cash flow modeling is that it's data and time intensive. Done comprehensively, there are lots of inputs to be gathered, a great deal of number crunching to be performed, potentially a dozen or more calculations for each year of the rest of your life, and reams of output data. Software tool support of some type is essential. An electronic spreadsheet like Excel can be a good starting point for this type of simple cash flow analysis. Rows in the spreadsheet represent a year in your life columns might include your age, beginning asset balance income like pension, Social Security, investment or rental expenses, taxes, net cash flow, and ending balance. This is workable for a simple analysis. However, setting up the formulas for such a spreadsheet model can be time consuming unless you're a spreadsheet whiz. Also, comparing different scenarios or modeling advanced situations can quickly become unwieldy. That's where the dedicated retirement planning tool comes in. The one I've used for years is the J and L Financial Planner. At its core is a simple and powerful financial simulator. First you set initial conditions such as current savings, expected returns and tax rates. Next, you define a schedule for financial events such as rate changes, deposits, transfers, loans, mortgages, debts and withdrawals. The program then takes the initial conditions you've defined and applies your events in an annual loop, reporting and graphing account balances and other metrics for each year. Along the way. The J and L Financial Planner also offers professional planning features such as multiple accounts, asset allocation, required minimum distributions, Monte Carlo and historic return analysis, Rule 72T distributions, and scenario comparison. The program is offered in several versions, including the entry level regular version for $80 and you can try it for 21 days before buying. Note this is Windows desktop software that has been around for many years. There may be some friendlier and more modern tools available on the web, but I doubt there's any more powerful. Ultimately, what you wind up with from a cash flow analysis is a long term picture of your net worth year after year going into the future. If that net worth stays level or goes up, that's good. If it trends down, then you're facing a sobering race against the calendar. Will your life or your money run out first? To be continued. You just listened to part one of the post titled how to Model the Retirement Income Gap by Darrell Kirkpatrick of caniretireyet.com when you're ready to start a
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Figuring out a good drawdown strategy is something discussed often in the fire community. While I DIY my financial planning and investing now, I'm in the accumulation phase and things are pretty simple at the moment. I definitely see myself consulting a flat fee advisor to help me with the kind of modeling described in this article. However, I've heard from many friends who are currently drawing down on their portfolios that in the face of an uncertain future, you're better off relying on general rules of thumb rather than trying to suss out and predict every last detail for the rest of your life. And that's what the 4% rule is. It's a guideline. The downside is that the model assumes that you have no other income and will never have any other income for the rest of your life, which for most people isn't true. Social Security is going to kick in at some point, if nothing else. Also, early retirees oftentimes go on to create businesses or find other hobbies that end up earning them some money that they didn't anticipate when they were retiring. It also assumes that you'll never decrease your spending for any reason. It doesn't consider when Medicare kicks in and reduces your health care costs. And it assumes that your personal rate of inflation will match the overall rate of inflation, which for the frugal among us is laughable. Rather than plan your withdrawals for the rest of your life based on the 4% rule, it makes more sense to have flexibility and refine your retirement plan and annually. Some other tools that I've heard great things about for modeling include Portfolio Visualizer and On Trajectory. Well, that should do it for today. Have a happy rest of your day and a great weekend and I'll see you in tomorrow's show where we'll finish up this post and where your optimal life awaits.
Title: How to Model the Retirement Income Gap [Part 1]
Host: Diania Merriam
Guest Post by: Darrow Kirkpatrick of CanIRetireYet.com
Date: March 22, 2026
Episode Number: 3499
This episode dives into the complexities of modeling retirement income, particularly when your income stream isn’t a steady, seamless transition from paycheck to pension or Social Security. Diania Merriam narrates and reflects on Darrow Kirkpatrick's insightful exploration of how to account for uneven income in retirement, moving beyond simplistic rules of thumb to more dynamic modeling approaches. Listeners will gain practical strategies to prepare for real-life retirement scenarios, armed with both actionable steps and philosophical wisdom.
Quote
"The only problem is that it isn't realistic. For many of us, that textbook version of retirement features a relatively steady and predictable cash flow...Unfortunately, the reality is that many of us...won't experience that steady fairy tale flow."
— Darrow Kirkpatrick (02:06)
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"By taking ownership of your own retirement model, you'll be in the driver's seat when inevitable changes happen and questions arise."
— Darrow Kirkpatrick (03:54)
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"Will your life or your money run out first?"
— Darrow Kirkpatrick (08:20)
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"Rather than plan your withdrawals for the rest of your life based on the 4% rule, it makes more sense to have flexibility and refine your retirement plan annually."
— Diania Merriam (11:36)
The episode balances Darrow Kirkpatrick's practical financial expertise and Diania Merriam's personable, motivational narration. It breaks down complex retirement modeling concepts into relatable, actionable insights—remaining realistic about the unpredictability of real-life finances while empowering listeners to take charge of their own retirement planning. The tone is encouraging, practical, and slightly humorous, especially when challenging common assumptions.
This is Part 1 of the topic. Tune in to the next episode for the continuation of this discussion on realistically modeling retirement income and bridging any gaps to ensure long-term financial security.