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SDIRA vs. Cash — Which Wins?

Use this calculator to model whether a specific investment is better held inside a Self-Directed IRA or with after-tax cash. The result hinges on whether the deal carries leverage — if it does, UBIT can quietly erode the SDIRA advantage.

The Deal

$
years
% of asset value

Rental cash flow, distributions, dividends — whatever the deal pays out each year.

% per year

Tax & Account

%

Used to tax cash-side annual cash flow (rental, distributions, dividends). Distribution tax for a Traditional SDIRA is set separately below.

%
%

Trust tax brackets compress to ~37% federal at modest income levels.

Self-Directed IRA Option

Traditional: distribution taxed as ordinary income. Roth: tax-free distribution if age 59½+ and 5-year rule met.

%

Your expected marginal rate when you take the distribution — usually lower than your current ordinary rate. Default 20%.

years
years

If under 59½, a 10% early-withdrawal penalty applies on the Traditional distribution and on Roth earnings.

Scenario A: Taxable Cash Account

Equity Invested $250,000
Total Asset Value (initial) $250,000
Debt $0

Operating Period (7 yr)

Cumulative pre-tax cash flow $120,750
Less: income tax on cash flow ($44,678)
Cumulative after-tax cash flow $76,073

Exit (Year 7)

Sale price $329,021
Less: debt payoff $0
Capital gain on appreciation $79,021
LTCG tax (incl. NIIT) ($18,775)
Net sale proceeds $310,246
Total After-Tax Value $386,319
Effective annualized after-tax return 6.4%

Scenario B: Traditional SDIRA

Equity Invested (inside IRA) $250,000
Total Asset Value (initial) $250,000
Debt $0

Operating Period (7 yr)

Cumulative pre-tax cash flow $120,750
Less: UBIT on debt-financed income $0
Cumulative cash accumulated in IRA $120,750

Exit (Year 7)

Sale price $329,021
Less: debt payoff $0
UBIT on debt-financed gain $0
IRA Balance at Sale $449,771

Distribution at Age 65

Distribution tax (Traditional only) ($166,415)
10% early-withdrawal penalty $0
Total After-Tax Value $283,356
Effective annualized after-tax return 1.8%

The Bottom Line

For this deal, holding it in cash beats the SDIRA by roughly $102,963 over 7 years.

The SDIRA still gets tax-deferred growth, but the ordinary-income tax owed at distribution age — combined with any UBIT on leverage — can give back more than it earns versus a taxable account with LTCG treatment on the appreciation. Toggle leverage, account type, and your tax assumptions to see the breakpoint.

Pressure-test this against your actual situation

What is a Self-Directed IRA?

A Self-Directed IRA (SDIRA) is a tax-advantaged retirement account that can hold alternative assets — real estate, private placements, syndications, private notes — rather than just publicly traded stocks and funds. The IRA itself owns the investment; the investor cannot personally use or benefit from the asset without triggering a prohibited transaction. Custodians like Equity Trust, Madison Trust, and IRA Financial handle the administrative side. UBIT (Unrelated Business Income Tax) is the critical gotcha: when the SDIRA uses debt to acquire an asset, the income and gain attributable to the debt-financed portion is taxed at trust rates, which compress to the top bracket fast.

Key Considerations

UBIT on Leverage

Debt-financed income and gain in an SDIRA trigger UBIT at trust tax rates (top federal bracket ~37%). A small annual exclusion (~$1,000) applies. UBIT is the single biggest reason leverage often kills the SDIRA advantage.

Depreciation Goes Unused

In a taxable account, real-estate depreciation shields ordinary income. Inside an SDIRA, that shield is “wasted” — the income is already tax-deferred. For high-depreciation deals (real estate, syndications), this can swing the math toward cash.

Early Withdrawal Penalty

Distributions before age 59½ trigger a 10% federal penalty on top of ordinary tax (Traditional) or on the earnings portion (Roth). If you might need the capital before then, the SDIRA is structurally illiquid in a way cash isn't.

Prohibited Transactions

You cannot live in, use, manage, or benefit personally from an SDIRA-owned property. Family members of certain degrees are also disqualified. Violating the rules can disqualify the entire IRA, triggering immediate full taxation of the account balance.

No Step-Up at Death

Assets held in a Traditional IRA do not receive a stepped-up basis at the owner's death. Heirs inherit the embedded ordinary income tax liability (subject to the 10-year withdrawal rule). Taxable real estate, by contrast, gets a full step-up — potentially eliminating decades of appreciation tax.

Roth's Quiet Edge

A Roth SDIRA gives up the up-front deduction but eliminates the back-end ordinary tax entirely. For investments with strong expected appreciation held to 59½+, Roth often produces the largest after-tax outcome of the three options.

What is a self-directed IRA?

A self-directed IRA (SDIRA) is a traditional or Roth IRA held at a custodian that allows alternative investments, such as real estate, private loans, private company shares, private funds, and precious metals, in addition to stocks and bonds. The tax rules are the same as any IRA. What changes is what you can own, and how much responsibility you take on for following the rules.

Rules that matter most

When an SDIRA can make sense

An SDIRA is most useful when you already have expertise in a particular alternative asset, the investment produces income that would otherwise be heavily taxed, and you can fund it without leverage or accept the UBIT cost. It is usually less attractive for leveraged real estate, assets you or your family would want to use, or investors who need liquidity. The calculator above compares holding the same investment inside an SDIRA versus in a taxable account. For broader context, see our guide to private credit and alternatives.

Frequently asked questions

What is a Self-Directed IRA (SDIRA)?

A Self-Directed IRA is a tax-advantaged retirement account that allows ownership of alternative assets such as real estate, private placements, syndications, and private notes — investments not available in a standard brokerage IRA. The IRA itself owns the asset; the investor cannot use it personally without triggering a prohibited transaction.

Why does leverage matter so much for an SDIRA investment?

When an SDIRA uses debt to acquire an investment, the income and gain attributable to the debt-financed portion of the asset is subject to Unrelated Business Income Tax (UBIT). UBIT is assessed at trust tax rates, which compress to the top marginal bracket very quickly. A leveraged real-estate deal that looks attractive at first can lose much of its tax-deferral advantage to UBIT, sometimes making a taxable cash investment more efficient.

Traditional SDIRA vs. Roth SDIRA — which is better for an investment like this?

A Traditional SDIRA defers tax on contributions and growth, then taxes distributions as ordinary income. A Roth SDIRA accepts after-tax contributions and provides tax-free distributions after age 59½ (assuming the 5-year rule is met). For a high-growth investment, Roth is often more attractive — appreciation never gets taxed inside or out. For investors expecting a lower ordinary tax rate in retirement than today, Traditional may be preferred. The calculator lets you toggle between the two.

What is a prohibited transaction in a self-directed IRA?

A prohibited transaction is a dealing between the IRA and a disqualified person, which includes you, your spouse, your parents and other ancestors, your children and other lineal descendants and their spouses, and entities you control. Examples include buying property from yourself, living in or using IRA-owned real estate, lending IRA money to a family member, or personally guaranteeing an IRA loan. A prohibited transaction can disqualify the entire IRA, making the full balance taxable as of the first day of that year.

What is a checkbook IRA?

A checkbook IRA is a self-directed IRA that owns a limited liability company, with the IRA owner serving as the LLC manager. It lets the owner make investments directly from the LLC bank account without routing each transaction through the custodian. It adds flexibility but also increases the risk of a prohibited transaction or recordkeeping error.

Important Disclosure: This calculator provides rough estimates for educational and illustrative purposes only and does not constitute tax, legal, financial, or investment advice. Rubiq Financial Partners is not a tax advisor, CPA, or attorney, and does not provide tax preparation, legal, or accounting services. The math here simplifies several aspects of real-world tax treatment, including UBIT computation under trust brackets, the small annual UBTI exclusion, depreciation recapture, passive activity loss rules, RMDs, state-by-state SDIRA rules, the 5-year Roth holding rule, and the specific consequences of prohibited transactions. Distributions assume the investor has met all applicable qualifying conditions. The calculator does not reflect custodial fees, sponsor fees, transaction costs, financing fees, or the practical illiquidity of SDIRA-held private investments. Tax rates and retirement-account rules are subject to legislative change. SDIRA investments are not bank-guaranteed and may lose value. Past performance does not guarantee future results. Always consult a qualified tax advisor, ERISA attorney, and financial advisor before making any retirement-account or alternative-investment decision.

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