Should You Adjust Your Inflation Assumptions Right Now?

If you’ve been paying attention to the news, it’s easy to feel like inflation is a force that can quietly reshape your financial plans in retirement. Prices shift, interest rates change, and suddenly the question becomes much more personal:

Should you be adjusting your inflation assumptions right now? 

The tricky part about inflation is that it’s never a fixed, predictable number; it behaves more like the weather than a constant. Some periods feel calm and manageable, while others bring sudden, unexpected shifts. And over time, the broader trends don’t always match what you’re personally experiencing day to day, which can make planning feel a bit more uncertain.

As you plan for retirement, inflation can directly impact how long your portfolio may produce enough income, how much income you may need later in life, and how confident you feel about your long-term plan. As experienced financial planners in the Chicago metro area, the SGL Financial team can help you make more measured decisions that may impact your retirement that could last 30+ years or longer.

In this article, we’ll look at the more relevant inflation-related questions we’re hearing from our clients. 

What Are Inflation Assumptions in Retirement Planning and Why Do They Matter?

Inflation assumptions in financial planning are the assumed rate at which your cost of living may increase over time. These assumptions are built into your financial plan and influence everything from your projected expenses to your withdrawal strategy.

Think of it like setting the treadmill’s incline. If the incline is too low, you may underestimate how hard you’ll need to work to keep up. If it’s too high, you could overcompensate and exhaust your resources faster than necessary.

Here are five commonly used inflation risk assumptions that can give you a more balanced view:

1. Base (Long-Term Average) Inflation: 2.5% – 3.0%

This is the starting point for many retirement plans. It’s based on long-term historical averages and assumes inflation stays relatively steady over time, even with short-term ups and downs. Think of this as the “normal” environment many plans are built around.

2. Elevated Inflation Scenario: 3.5% – 4.5%

This assumption accounts for a period of sustained higher inflation. It doesn’t assume extreme conditions, but it does reflect the possibility that inflation remains above historical norms for longer than expected. This is often used for stress-testing retirement income projections.

3. Short-Term Spike Followed by Normalization

In this scenario, inflation runs higher in the near term (for example, 4%–6% over the next few years) before gradually returning to long-term averages. This aligns with what we often see during economic disruptions; temporary pressure followed by stabilization.

4. Low Inflation / Disinflation Scenario: 1.5% – 2.0%

While less used in our assumptions, periods of lower inflation can also occur. This assumption reflects slower economic growth or easing price pressures and can be helpful when comparing different long-term outcomes.

5. Category-Specific Inflation (Blended Approach)

Not all expenses rise at the same rate. A more refined approach separates inflation by category. This creates a more personalized inflation assumption rather than relying on a single number:

• Healthcare: Often higher than average
• Lifestyle spending (travel, dining): Variable
• Core expenses (food, utilities): Closer to baseline
  

The key isn’t picking the “perfect” assumption; it’s understanding how your plan responds under different conditions. A well-structured financial plan often incorporates multiple scenarios to help you make decisions with a clearer view of potential outcomes.

This is why, as Chicagoland financial professionals, we focus less on pinpoint accuracy and more on building plans that can adapt to multiple possibilities.

Check out our Quick Guide: What Retirement Planning Details Do People Often Overlook?

Are Recent Inflation Spikes a Short-Term Event or a Long-Term Shift?

One of the biggest questions is whether current inflation levels represent a lasting trend or a temporary spike. Short-term increases in inflation often reflect specific conditions:

• Supply chain disruptions
• Energy price fluctuations
• Policy changes or economic shocks
  

These can cause sharp increases in inflation that feel significant in the moment but may not persist in the long-term. Structural inflation, on the other hand, is more gradual and driven by broader forces like demographics, labor markets, and productivity trends. 

A helpful way to think about this is like a sudden thunderstorm versus a change in climate. One is intense but temporary; the other reshapes expectations over time.

If you adjust your entire retirement plan based on a short-term spike, you may be reacting to current weather conditions rather than climate.

Should You Adjust Your Inflation Assumptions Right Now?

The honest answer is: it depends on how your current plan is structured.

If your plan hasn’t been reviewed in several years, it may make sense to revisit your assumptions. Inflation isn’t a static number, and neither should your financial plan be. However, making large, immediate changes based solely on recent data can create unintended consequences. Increasing your inflation assumption too aggressively may:

• Lead you to withdraw less than necessary today
• Push you toward overly conservative investment decisions
• Distort long-term projections in a way that doesn’t reflect long-term reality
  

This is where working with financial planners in the Chicago metro area can provide a more balanced perspective. Instead of reacting to headlines, the focus is on evaluating how inflation fits into your broader financial picture.

How Can You Adjust Retirement Projections Responsibly?

When you adjust your retirement projections, it should be more of a fine-tuning exercise rather than a complete reset. The goal isn’t to react to every inflation headline, but to understand how changes actually impact your plan and make measured adjustments over time.

• Start by testing sensitivity before changing assumptions. A small increase in inflation may assume an increase in your long-term expenses, but it doesn’t automatically derail your plan. Running a few scenarios side by side often gives you better clarity than outright replacing your assumption.
• Next, look at spending flexibility before making major changes to your investment strategy. In many cases, small adjustments to discretionary spending can have a more meaningful impact. For instance, delay larger expenses or temporarily reduce withdrawals rather than make major changes to your entire investment strategy. 
• It’s also important to avoid overcorrecting. Raising assumptions too aggressively or becoming overly conservative can lead to decisions that don’t reflect long-term reality, especially if inflation stabilizes.
• Finally, revisit your assumptions regularly, and not as a reaction to current events. A consistent review process, rather than one-time changes, helps keep your plan aligned as conditions evolve.

In practice, responsible adjustments come down to this: test different scenarios, make incremental changes, and ensure each decision is tied to your broader financial plan.

What Happens If You Overreact to Inflation?

One of the more common pitfalls is emotional overcorrection. When inflation rises, it’s natural to want to take action. But reacting too quickly can create new risks that weren’t there before. For example, you might:

• Reduce spending more than necessary
• Shift your portfolio to be too defensive
• Delay decisions that could otherwise support your long-term goals
  

Over time, these reactions can compound in ways that may not align with your original plan. This is where working with financial advisors can help you step back and evaluate alternative scenarios more objectively.

How Often Should You Review Inflation Assumptions?

Inflation assumptions shouldn’t be set once and forgotten. Instead, they should be revisited periodically as part of your broader financial planning process. This could include: 

• Reviewing assumptions annually or during major life changes
• Updating projections when there are meaningful shifts in economic conditions
• Reassessing how inflation interacts with taxes, income, and investment strategy
  

The key is consistency. Small, regular adjustments tend to be more effective than large, reactive changes.

How Does Inflation Impact Different Parts of Your Plan?

Inflation shows up differently depending on where you’re spending your money. That’s why using a single, flat assumption across your retirement plan can overlook real pressure points over time. A well built retirement plan should examine how different spending categories behave and how that could shape your long-term projections.

• Everyday Expenses Tend to Rise Gradually: Core expenses like groceries, utilities, transportation, and housing typically increase steadily over time. These baseline costs support your retirement lifestyle, and while increases may feel manageable year to year, the cumulative impact can be significant.
• Example: A 3% annual increase may not seem meaningful in the short term, but over time it can materially raise the income needed to maintain your lifestyle. These expenses are generally non-negotiable, making proactive planning essential.
• Healthcare Costs Often Follow a Different Path: Healthcare is one of the most variable components of retirement spending and doesn’t always track with general inflation. Historically, costs have risen at a higher rate and can be less predictable. Spending often occurs in phases—lower in early retirement, then increasing later as needs evolve.
• Example: You may spend relatively little on healthcare in your early 60s, but see a noticeable increase in your 70s or 80s. A plan that assumes a flat inflation rate across all expenses may understate this shift and its impact on your long-term income needs.
• Lifestyle Spending Is More Flexible and More Personal: Spending on travel, dining, hobbies, and entertainment is driven more by personal choice than inflation alone. This flexibility can be a strength, giving you room to adjust as conditions change.
• Example: If inflation rises unexpectedly, you might scale back discretionary spending for a period of time. Alternatively, you may choose to spend more in the early, more active years of retirement and reduce spending later. Because of this variability, lifestyle expenses don’t always need to follow a fixed inflation assumption.

Not all inflation is created equal. Breaking your plan into categories—essential, healthcare, and discretionary—can provide a more realistic view of how costs may evolve over time. This approach allows for more precise projections and helps identify where you have flexibility and where you don’t, ultimately leading to a more resilient retirement plan.

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Does Inflation Have a Compound Effect?

Yes, inflation has a compound effect, and it’s actually one of the most important ways economists and financial planners think about it over time. Inflation behaves similarly to compound interest—but in reverse. Instead of growing your money, it erodes purchasing power over time, and it does so exponentially rather than linearly.

Here’s how it works: when prices increase by 3% in one year, that higher price becomes the base for the next year. So the following year’s 3% increase applies to an already higher amount—not the original price.

A simple way to express this relationship is:

Future Value = Present Value × (1 + inflation rate)^number of years

A Simple Example:

If something costs $100 today and inflation averages 3%:

• After 1 year: $103
• After 2 years: $106.09
• After 10 years: about $134
• After 30 years: about $243

If inflation were applied as a simple increase (not compounded), that same item would only cost $190 after 30 years. The difference highlights how powerful compounding can be over time.

Additional thoughts and considerations:

Even modest inflation—around 2–4%—can significantly impact long-term financial plans. At a steady 3% rate, purchasing power is effectively cut in half about every 24 years (using the Rule of 72).

This has several important implications:

• Cash loses value over time: Sitting on the sidelines during inflationary periods can quietly erode real wealth
• Returns must outpace inflation: Investments need to grow faster than inflation (after taxes) to maintain purchasing power
• Long-term planning must account for it: Retirement income, spending assumptions, and wage growth all need to reflect compounding inflation

In short: yes, inflation compounds, and that’s precisely why it’s so powerful (and often insidious) over long periods.

What Role Does Flexibility Play in Managing Inflation Risk?

If there’s one theme that stands out in today’s environment, it’s the importance of flexibility. Rather than trying to predict inflation with precision, the focus shifts to building a plan that can adapt:

• Adjusting withdrawals when needed
• Rebalancing investments based on changing conditions
• Revisiting assumptions as new information becomes available
• Rethinking your tolerance for long-term risk
  

This approach acknowledges that uncertainty is part of the process, not something you can eliminate entirely. For you, that may mean focusing less on finding the “perfect” inflation number and more on creating a plan that can respond to change over time.

What Should You Do Next If You’re Concerned About Inflation?

If inflation is a long-term concern, it may be worth taking a closer look at how your current plan accounts for it. Start by asking:

• When was the last time your assumptions were updated?
• How sensitive is your plan to changes in inflation?
• Are your projections based on a single scenario or multiple possibilities?
• Will current assumptions fit future outcomes?
  

These questions can help you better understand whether adjustments are necessary, and, if so, how significant they should be. Working with a Chicagoland CFP® professional can provide additional perspective, especially if you’re looking for a more structured approach to retirement planning.

At SGL Financial, the focus is on helping you connect these moving parts into a plan that reflects your goals and adapts over time. Because when it comes to inflation, the question isn’t just whether it’s rising; it’s how your plan responds when it does.

Ready to discuss your retirement plan with a team of experienced financial professionals? Let’s start a conversation.