For decades, the “4% Rule” has been a convenient rule of thumb: withdraw 4% of your portfolio annually, adjusted for inflation, and you’re unlikely to run out of money in a 30-year retirement.
But for globally mobile clients—particularly Canadians and Americans living across the border—life rarely follows the neat assumptions embedded in that formula. Currency fluctuations, tax treaty differences, inflation divergence between countries, and non-aligned retirement systems (RRSPs, IRAs, 401(k)s, CPP, OAS, Social Security) make a simple static withdrawal rule inadequate.

A new framework proposed by Stefan Sharkansky in the Financial Analysts Journal (September 2025) offers a more elegant and actionable alternative. His paper, “The Only Other Spending Rule Article You Will Ever Need,” builds on the Annually Recalculated Virtual Annuity (ARVA) model first introduced by Barton Waring and Laurence Siegel in 2015.
In short, Sharkansky’s work replaces the idea of a fixed withdrawal percentage with a mathematically precise amortization of your portfolio—designed to provide lifetime income, adjust automatically to market realities, and remove the possibility of depleting your capital too soon.
At Cardinal Point, we see this as a powerful concept for cross-border families seeking sustainable retirement income strategies that respect both countries’ tax systems and inflation environments.
The Core Idea: Two Assets, One Adaptive Framework
Sharkansky’s strategy is intentionally simple:
- A ladder of inflation-indexed government bonds—in the U.S., Treasury Inflation-Protected Securities (TIPS); in Canada, Real Return Bonds (RRBs)—held to maturity to provide a guaranteed, inflation-adjusted income floor.
- A broad-market equity index fund to supply long-term growth and discretionary income potential.
Together, these two components form a self-contained “engine” for lifetime income. The retiree spends the real-income stream from the bond ladder and withdraws from the equity side using an amortization formula that automatically recalibrates each year based on the remaining horizon, discount rate, and market value.
Unlike fixed-rate rules, the portfolio can never mathematically run out of money within the chosen time horizon. And unlike commercial annuities, it preserves flexibility, liquidity, and estate value.
Why It Matters for Cross-Border Households
Cross-border retirees face a unique convergence of challenges:
- Currency exposure. Canadians retiring in Florida or Americans moving to British Columbia may have expenses and pensions denominated in different currencies.
- Tax asymmetry. Canadian and U.S. tax rules differ in how they treat RRSP/RRIF income, IRAs, Roth IRAs, 401(k)s, and non-registered accounts.
- Inflation divergence. Canada’s CPI and U.S. CPI-U rarely move in lockstep; protecting real purchasing power requires flexibility.
- Longevity and healthcare variability. Different health systems, insurance costs, and life expectancies complicate long-term projections.
A withdrawal rule that is both adaptive and transparent—such as ARVA—helps reconcile these moving parts by explicitly linking each year’s income to prevailing market returns and current life expectancy, not to rigid assumptions set decades earlier.
From Fixed Rules to Dynamic Amortization
Traditional withdrawal frameworks—like the 4% rule or “guardrails” used by advisors (e.g., Guyton-Klinger 2006)—revolve around a static withdrawal rate adjusted only after major market shifts. Sharkansky argues that these rules either:
- Undershoot, leading clients to live below their means and leave unintended estates; or
- Overshoot, risking depletion if returns disappoint early in retirement.
By contrast, ARVA applies the same mathematics used in annuity pricing or mortgage amortization, but recalculated annually. Each year’s withdrawal equals a share of the current portfolio designed to deplete the equity side precisely at the end of the planning horizon (say, 30 years), given the assumed long-term real return—6.9% in Sharkansky’s 150-year U.S. data set.
This means retirees spend more when markets are strong and less when markets weaken, but the plan never runs dry. Over time, the retiree extracts more total income, with variability that is transparent and controllable.
Key Findings from the Research
Sharkansky’s 150-year simulation (1871–2023) compared numerous strategies:
| Strategy | Median Lifetime Real Income | Risk of Running Out | Legacy Bias |
|---|---|---|---|
| 4% Rule | Lower | Low | Large surplus |
| Guyton-Klinger “Guardrails” | Moderate | Low | High legacy |
| ARVA (100% Equities + TIPS Ladder) | Highest | None (mathematically) | Customizable |
Highlights:
- A 100% equity allocation, amortized at 6.9% real return, historically produced higher and more consistent median withdrawals than 60/40 or 80/20 mixes—without worse downside results.
- Replacing conventional bond funds with a TIPS or RRB ladder stabilized income more effectively than any mixed bond allocation.
- The ARVA method guaranteed non-depletion, whereas guardrail systems could fail under prolonged poor returns.
- Income variability exists but can be managed by sizing the inflation-linked bond ladder to cover essential expenses.
Translating the Framework Across the Border
For a Canada–U.S. retiree, implementing Sharkansky’s approach requires adapting it to different inflation indexes, interest-rate curves, and tax rules:
1. Building the Inflation-Protected “Floor”
- In the United States: construct a ladder of TIPS maturing each year for 20–30 years, matching essential after-tax spending needs.
- In Canada: use Real Return Bonds (RRBs) where available or consider short-duration nominal bonds plus inflation swaps as proxies.
- Tax note: TIPS and RRBs accrue taxable inflation adjustments annually. In registered accounts (IRA, RRSP, RRIF), these taxes are deferred; in taxable accounts, after-tax yield should be used when calculating the income floor.
- Currency coordination: A U.S.-resident Canadian retiree might hold a portion of the ladder in USD TIPS to match U.S. expenses, and another portion in CAD RRBs or short-term GICs for Canadian expenses.
2. The Growth Portfolio
- Equity exposure: low-cost global or U.S. total-market index ETFs (e.g., VTI or VT) in USD accounts; Canadian residents can mirror exposure through cross-listed ETFs or U.S. dollar RRSPs.
- Tax efficiency: Canada–U.S. treaty provisions exempt U.S. withholding tax on dividends paid to RRSPs but not to taxable accounts. Conversely, U.S. residents must report Canadian ETF income as foreign.
- Rebalancing: no rebalancing needed between the stock portfolio and bond ladder; each side serves distinct objectives.
3. Managing the Planning Horizon
For most clients, the ladder covers 25–30 years of essential expenses. Longevity risk beyond that can be addressed by:
- Extending the ladder gradually by reserving equity proceeds to buy new long-dated TIPS or RRBs each year.
- Maintaining part of the portfolio in equities earmarked for very-late-life healthcare or estate purposes.
- In some cases, layering a small, deferred life annuity beginning at age 85–90 can hedge the tail risk efficiently.
Advantages Over Traditional Decumulation Models
Transparency and Control
Clients can calculate their next-year withdrawal with a spreadsheet—no opaque Monte Carlo probabilities or subjective “success rates.” The math ensures the account balance aligns with remaining life expectancy.
Tax Coordination
Because the framework specifies which assets fund which years, Cardinal Point advisors can match income sources to optimal tax jurisdictions:
- Draw U.S. IRAs or 401(k)s up to the top of a marginal bracket while converting RRSPs to RRIFs.
- Realize capital gains strategically in the country of residence.
- Sequence withdrawals to manage foreign-tax credits and OAS clawback.
Inflation and Currency Protection
TIPS or RRBs provide real purchasing-power stability. For clients spending in both currencies, the ladder can be split by geography—locking in real income in CAD for Canadian expenses and USD for U.S. ones.
Behavioral Comfort
Clients know their “base income” is covered by the inflation-protected floor. The equity side becomes a variable bonus rather than a source of anxiety when markets fluctuate.
Example: A Cross-Border Couple
Facts:
- Dual citizens, age 67 and 65, living in Florida
- $3 million USD combined retirement assets (60% USD IRAs, 40% CAD RRSPs/RRIFs).
- Annual spending goal: $150,000 USD (80% U.S. expenses, 20% Canadian).
Implementation:
- $1.2 million USD TIPS ladder (30 years) generating ~$54,000 real USD per year for essential expenses.
- $1.8 million global equity ETF portfolio amortized over 30 years at 6.9% real rate → first-year withdrawal ≈ 7.5% = $135,000 USD.
- Withdrawals recalculated annually; equities drawn from U.S. IRAs and Canadian RRIFs proportionately, considering currency needs and marginal brackets.
Outcome:
- Total expected real income: ~$180,000 USD initially (above target).
- No probability of depletion within 30 years, assuming the 6.9% real rate on the ETF portfolio.
- Income will vary modestly with equity returns but maintain inflation protection on essentials.
- Surplus equity growth can extend the ladder or fund legacy gifts.
This approach bridges both currencies, aligns taxation under the treaty, and allows spending flexibility without annuitizing capital or taking uncompensated risk.
Managing Longevity and Behavioral Risks
Sharkansky notes that no withdrawal rule can simultaneously guarantee lifetime sustainability, a flat income, and a fixed bequest. Something must give. The ARVA framework makes those trade-offs explicit.
For clients concerned about living past 95:
- Extend the amortization horizon each year based on updated survival probabilities.
- Reinvest unneeded income into new TIPS maturities (“rolling ladder”).
- Integrate longevity insurance or permanent life insurance in Canada to cover final-expense and estate liquidity needs.
For those who prefer income stability:
- Increase the proportion of the portfolio in TIPS or RRBs until essential lifestyle costs are guaranteed at 90–95% confidence.
- Treat the equity withdrawals as discretionary “bonuses,” similar to variable pension distributions.
At Cardinal Point, we often express this concept to clients as follows:
“Let’s secure your floor income for life in both currencies—then let markets determine your lifestyle bonuses each year.”
Tax-Smart Execution in a Cross-Border Framework
A theoretical spending rule becomes powerful only when executed through coordinated cross-border tax planning. Considerations include:
- Asset location: Hold TIPS or RRBs in tax-deferred accounts to avoid annual taxation on inflation adjustments; place equity ETFs in taxable or Roth accounts for capital-gains treatment.
- Currency translation: Apply forward-looking FX assumptions; avoid unnecessary conversions that trigger gains.
- Pension sequencing: Integrate CPP, OAS, and U.S. Social Security timing with ARVA withdrawals to balance taxable income.
- Estate implications: TIPS and equities held in U.S. accounts may create U.S.-situs exposure for Canadian residents; use joint ownership or trusts to mitigate estate tax risk.
Our cross-border structure allows Cardinal Point to model these variables in both tax systems simultaneously—optimizing for after-tax, after-inflation, and after-currency income.
The Behavioral Side: Redefining “Success” in Retirement
Most retirement projections express outcomes in terms of a “probability of success.” Sharkansky argues this language is misleading: a 95% success rate still means living too frugally 95% of the time.
Under the ARVA lens, “success” becomes maintaining desired purchasing power while flexibly adapting to markets. Retirees should measure satisfaction not by the size of their bequest but by the consistency of their lifestyle.
At Cardinal Point, we often pair ARVA-style spending projections with our cross-border cash-flow planning tools, allowing clients to visualize a range of income paths under both currencies and tax systems.
A Smarter Spending Rule for a Cross-Border World
Stefan Sharkansky’s research revives a simple truth: you don’t need complex Monte Carlo models to retire securely. You need a disciplined, inflation-protected income floor and a transparent method for drawing from growth assets.
For Canadian-American families managing assets on both sides of the border, the ARVA framework can form the mathematical core of a truly integrated decumulation plan—one that:
- Maximizes after-tax, after-inflation lifetime income;
- Eliminates the fear of running out of money; and
- Provides a flexible bridge between currencies, jurisdictions, and generations.
At Cardinal Point Wealth Management, we specialize in designing these integrated cross-border retirement systems—linking TIPS and Real Return Bond ladders, portfolio amortization, and dual-country tax optimization into a single coordinated plan.
For a customized cross-border retirement income plan using ARVA and inflation-linked strategies, contact Cardinal Point Wealth Management’s dual-licensed advisory team.


Using Bespoke Data we can look back at the S&P 500’s individual trading days since 1952, and see that the market has traded within 5% of its all-time high over 44% of the time. In other words, for almost half the market’s trading days the index was at (or very close to) its all-time highs. So that is a normal pattern, not an anomaly.
But that raises a compelling question. New highs may be common, are investors really well-served when buying into the market at such lofty price points? The answer and the numbers may surprise you. The chart below from Creative Planning CEO Peter Mallouk compared 1, 3 and 5-year return when investing on any given day, versus when markets were at all-time highs.


