Retirement Income Planning: How Much Will You Actually Have Each Month?

The most important question in retirement planning isn't "how much do I have?" It's "how much can I safely spend each month—for the rest of my life?" These are very different questions with very different answers. A million-dollar portfolio sounds impressive until you realize it may need to last 30 years, generate income despite market volatility, withstand inflation, and cover healthcare costs that escalate faster than general inflation.

Reference: https://www.plootus.com/retirement-income-calculator

The Income Stack: Building Your Monthly Retirement Income

Most retirees draw from multiple income sources that must be coordinated carefully. Understanding each component and how they interact determines whether your retirement income is sufficient, sustainable, and tax-efficient.

Social Security

Social Security is the foundation of retirement income for most Americans—the largest guaranteed, inflation-indexed income source available. Your benefit amount depends on your 35 highest earning years and when you claim (from 62 to 70). Claiming at 62 reduces your benefit by up to 30% compared to your Full Retirement Age benefit. Delaying to 70 increases it by 24–32% above Full Retirement Age. For married couples, the claiming strategy can mean hundreds of thousands of dollars in lifetime benefit differences.

Workplace Retirement Accounts (401(k), 403(b), IRA)

Portfolio withdrawals from tax-deferred accounts are taxable as ordinary income. The 4% rule—withdrawing 4% of your portfolio in year one and adjusting for inflation thereafter—is a common starting framework, though not a guarantee. At 4%, a $600,000 portfolio generates $24,000/year ($2,000/month). However, sequence-of-returns risk—the danger of a major market decline in the early years of retirement—can significantly compromise this projection.

Roth Accounts

Roth IRA and Roth 401(k) withdrawals are tax-free, making them extraordinarily valuable in retirement for managing your tax bracket. Strategically using Roth funds to stay within a lower tax bracket (rather than pushing into a higher one with large traditional account withdrawals) can save thousands annually.

Pension Income

If you have a defined-benefit pension, your monthly pension check is a fixed income stream that doesn't depend on market performance. Pensions reduce the amount of portfolio withdrawal needed, but most aren't inflation-indexed—meaning their real value declines each year.

HSA Funds for Healthcare

If you've invested HSA funds, they become a tax-free resource for Medicare premiums, out-of-pocket medical costs, dental, vision, and other healthcare expenses. Using HSA funds for healthcare preserves portfolio assets for other uses and avoids income taxes on healthcare spending.

The Monthly Income Calculation

Here's an example of how the income stack works for a hypothetical 67-year-old retiree with a $700,000 portfolio:

• Social Security: $2,400/month

• 4% portfolio withdrawal: $700,000 × 4% = $28,000/year = $2,333/month

• Small pension: $800/month

• Total: approximately $5,533/month gross income

After taxes (which depend heavily on Roth vs. Traditional split, state taxes, and deductions), net monthly income might be $4,800–$5,200. Whether that meets your monthly expenses depends on where you live and your lifestyle—and that's the central planning question.

The Retirement Income Gap

The gap between what your income sources provide and what your expenses require is called the retirement income gap—and it's the primary risk to address in retirement planning. Strategies to close the gap include: increasing portfolio withdrawals (higher risk), delaying retirement (more savings), reducing spending (most direct), relocating to a lower-cost area (often most impactful), or taking part-time work (bridges income and Social Security delay simultaneously).

Using a Retirement Income Calculator Effectively

A retirement income calculator lets you input your specific numbers—portfolio balance, expected Social Security benefit, pension income, expected expenses—and model different scenarios. The most useful exercises:

• What happens if I retire 2 years later?

• What happens if I delay Social Security from 62 to 70?

• What happens if inflation runs at 3% instead of 2%?

• What happens if my portfolio earns 5% instead of 7%?

• What happens if I move to a lower-cost state?

Each scenario change reveals the sensitivity of your plan to different variables—and highlights which levers have the most impact on your retirement security.