In this guide
Why the Roth wrapper changes the math
A self-directed IRA doesn't make an investment better; it changes who pays tax on the outcome. In a traditional SDIRA, rent, interest, and appreciation are merely deferred — then taxed at ordinary rates in whatever bracket you occupy in your seventies. In a Roth SDIRA the same dollars come out at zero, once you're past 59½ and the five-year clock.
That gap is trivial for a bond fund and enormous for an alternative asset, because alternatives are where large, back-loaded gains live: a syndication that returns 3×, a company that gets acquired, a building that stabilizes far higher. Move the asset into a Roth before the gain and tax stops being the biggest line in the deal.
Alternative assets carry real risk of total loss of principal. They are illiquid, often valued by estimate rather than by market, and a recurring venue for fraud — regulators warn about promoters who use the "IRS-approved custodian" label as a credibility prop. A custodian holding an asset is a clerical fact, not an endorsement. No tax wrapper has ever rescued a bad deal. A Roth SDIRA makes a good investment better, and a bad one into a bad investment you also paid conversion tax on.
Roth SDIRA vs traditional SDIRA vs brokerage Roth
Three accounts, three jobs. Most people who go self-directed own two of them at once.
| Self-directed Roth IRA | Traditional (self-directed) IRA | Brokerage Roth IRA | |
|---|---|---|---|
| Tax on the way in | After-tax, or tax at conversion | Deductible / pre-tax | After-tax dollars |
| Tax on growth & withdrawal | Tax-free if qualified (59½ + five years) | Ordinary income on every dollar out | Tax-free if qualified |
| Assets allowed | Real estate, private equity, notes, metals | Same, at a self-directed custodian | Public securities only |
| Lifetime RMDs | None for the original owner | Yes — from your RMD age | None |
| Typical cost | Setup + annual and per-asset fees | Same | Usually $0 |
| UBIT / UDFI exposure | Yes, on leverage or operating income | Yes — identical | Rare (some MLPs) |
| What it's for | Holding one alternative asset you expect to grow a lot | Acquiring that asset cheaply, then converting | Liquid core portfolio |
Read the last row twice — that's the strategy in a line. The traditional SDIRA is often the acquisition vehicle and the Roth SDIRA the holding vehicle, with a conversion in between at the moment the asset is worth least. Index funds belong in neither; that's what a free brokerage Roth alongside it is for.
2026 contribution limits: one cap, shared
For 2026 the IRA contribution limit is $7,500, or $8,600 if you're 50 or older (the catch-up rose to $1,100), per the IRS's 2026 cost-of-living announcement. A self-directed Roth doesn't create a second allowance: that figure covers every traditional and Roth IRA you own, and excess contributions draw a 6% excise tax each year they remain. Contributions must also be cash — the IRA receives dollars and buys the asset itself.
Why contributions are almost never the point. $7,500 a year does not buy real estate. Realistic funding means a Roth conversion of existing IRA or old-401(k) money, which has no dollar limit — or a rollover into a traditional SDIRA, an acquisition, and a conversion later.
Income limits — and the backdoor route
The Roth income test applies unchanged. For 2026, direct Roth contributions phase out over these modified-AGI ranges (IRS, 2026 figures):
| Filing status | 2026 MAGI phase-out for direct Roth contributions |
|---|---|
| Single / head of household | $153,000 – $168,000 |
| Married filing jointly | $242,000 – $252,000 |
| Married filing separately (lived with spouse) | $0 – $10,000 |
Below the range you contribute in full; inside it your allowance tapers; above it you can't contribute directly. That last group is most of the audience for self-directed investing — which is why the phase-out matters less than it looks: there is no income limit on Roth conversions. High earners use the backdoor route or convert pre-tax money outright. Watch the pro-rata rule: a large illiquid traditional IRA joins the blend the IRS computes across all your IRAs, and can make a clean backdoor impossible.
Converting an existing self-directed IRA to Roth
This is the transaction that creates most self-directed Roth accounts, and it turns on one number: fair market value on the conversion date. Under IRC §408(d), taxable conversion income equals the FMV of what moved. For a mutual fund that's a closing price. For a fourplex, a note, or an LLC interest there is no price — somebody must establish one, and that somebody should not be you.
- Get a qualified, independent appraisal. A state-certified appraiser valuing real property as-is, dated close to the conversion; for entity interests, one who can support each discount claimed. Self-reported estimates are the weakest position under examination.
- The IRA pays for it, and the appraiser must be unrelated to you. Paying personally is a contribution at best, a prohibited transaction at worst.
- Leverage is netted. Property carrying a non-recourse loan converts at net equity: a $900,000 building against a $750,000 loan is $150,000 of income, not $900,000.
- Convert in pieces. Splitting a large SDIRA across two or three tax years keeps each year's income in a bracket you chose.
- Pay the tax from outside the IRA. An illiquid account may hold no cash, and pulling cash out shrinks the Roth and can trigger a penalty under 59½.
Net equity is why timing matters: equity is a thin residual after debt, so a modest dip in value produces a far larger dip in the number you're taxed on. That's the mechanism behind the J-curve conversion strategy — converting a value-add property mid-renovation, when as-is value and therefore equity are lowest. Model the year first in the Roth conversion calculator.
Self-directed Roth IRA real estate
Real estate is the dominant self-directed Roth asset, and the Roth version has two advantages the traditional version doesn't. First, rent and appreciation both land in the tax-free column. A property throwing off $30,000 a year that eventually sells for double is, in a traditional SDIRA, a large ordinary-income event deferred into your seventies. In a Roth the rent compounds untaxed and the proceeds are simply yours.
Second, no RMDs. A traditional IRA holding one illiquid building must distribute a percentage of its value every year once RMDs begin — and a building can't be sliced, so owners end up distributing fractional interests in kind or selling at the wrong moment. A Roth SDIRA has no such clock.
Mechanically it's the same as any SDIRA: the IRA takes title, pays every expense, collects every dollar of rent, and any borrowing must be non-recourse — you cannot personally guarantee it. Leverage brings UDFI with it, a tax the IRA owes on the debt-financed share of income. A real carrying cost, not a disqualifier — but it belongs in the projection from day one.
Choosing a custodian: categories, not names
We take no compensation from any custodian and name no favourites, so here's the framework instead. Firms fall into three groups:
- Trust companies that take actual custody. State-chartered or bank-regulated, holding title and handling IRS reporting. Slower and more procedural — that friction is largely the point.
- Administrators. They process paperwork but don't take custody; a separate custodian sits behind them. Ask which entity actually holds the assets — it matters in a dispute.
- Checkbook-control platforms. The IRA owns an LLC and you, as manager, transact from a bank account. Fast and cheap per transaction, and it moves the whole compliance burden onto you.
On fees, structure matters more than the sticker. Flat annual fees stay flat as the account compounds; asset-based fees scale with every dollar of growth, which is backwards for an account you opened because you expect it to grow. Add setup charges, per-asset holding fees, and transaction fees. Published schedules commonly sit in the low hundreds of dollars a year — get the whole schedule in writing and model it over ten years, not one. Then screen for how long the firm has held custody and whether it will hold your asset type. And remember what a custodian is not: it doesn't vet investments, doesn't verify valuations, and won't stand between you and a §4975 violation.
The self-directed Roth IRA rules you can't break
The compliance rulebook is identical for Roth and traditional SDIRAs, and the self-directed IRA pillar guide covers it in full. In one sentence: under IRC §4975 the IRA may not transact with a disqualified person — you, your spouse, lineal ancestors and descendants and their spouses, entities you control — nor confer any present personal benefit on them; break that and the whole account can be treated as distributed on January 1 of that year.
Two Roth-specific overlays deserve their own line. The five-year clock for tax-free earnings starts with your first-ever Roth contribution and covers every Roth you later open — so an SDIRA opened today inherits a clock started years ago. And each conversion carries its own five-year period for the 10% penalty, tracked by year, not by account.
Where this goes wrong
The failure modes are predictable. Someone converts a large illiquid position at an optimistic self-assessed value and has no defence when it's questioned. Someone converts and then can't pay the tax, because the account is a building. Someone buys a "guaranteed" private placement from a promoter whose only credential is that a custodian will hold it. Someone does their own repairs and disqualifies a seven-figure account.
Used well, a self-directed Roth IRA is one of the most powerful structures in the code: an asset you understand, bought at a sensible price, converted when its measured value is low, then compounding with no RMDs and no tax at the end. Used carelessly, it turns an ordinary investment mistake into an irreversible one. Build it with SDIRA counsel and your CPA, model the conversion year in the calculator — other tools live on the calculators page — and never let the tax tail wag the investment dog.