My IRA funded a bridge fund position and the K-1 keeps coming back wrong

The accrual versus cash explanation the sponsor gave is real, but it does not account for everything. Bridge funds that use interest reserves or PIK structures will book income before cash moves, and if the fund changed its accounting method or the loan pool had a payoff event mid-year, the K-1 line items can shift in ways that look like errors but are actually correct under a different recognition timing than the deal deck implied. What I would check first is whether the fund issues audited financials and whether the K-1 figures tie to the Schedule K-1 line codes in those audited statements, because the mismatch you want to find is between the fund's own books and what the K-1 says, not between the K-1 and your deal deck expectations.

The custodian passing the document through without commentary is standard and not a problem in itself, so I would not spend energy there. The question worth putting directly to the fund administrator is which tax basis the fund files on and whether any restatements or amended K-1s have been issued across the investor base, because if yours is the only one that reads differently each year that points to a reporting error specific to your account, whereas if everyone's shifts year to year the explanation is genuinely fund-level accrual mechanics.

One thing that does matter for your IRA specifically: UBTI exposure inside a bridge fund depends heavily on whether the fund uses leverage at the vehicle level, and if it does, the K-1 should have a Box 20V entry or equivalent that your CPA needs to flag before you redeploy. Your CPA's uncertainty about SDIRA K-1s is the actual risk sitting in this conversation right now.

What does the fund's limited partnership agreement say about the accounting method, and did the fund provide a capital account statement alongside the K-1?

The variance you are describing is genuinely one of the more confusing parts of SDIRA investing in funds, and the sponsor's timing explanation is usually the right one, though "usually" is doing real work in that sentence.

Here is what is actually happening in most cases like this. A bridge fund typically holds short-term loans. Interest on those loans accrues daily but may be recognized differently depending on whether the fund's books run on accrual basis (income recorded when earned) or cash basis (income recorded when received). The deal deck you signed almost certainly projected cash flow on one assumption, and the fund's accountants may be booking income on the other. When your K-1 reflects accrued but not yet distributed income, it can look like a mismatch even though both numbers are technically correct, just measuring different things.

The IRA wrapper does not change the K-1 mechanics. The fund issues the same K-1 regardless of whether the LP interest sits in an IRA or a taxable account. What changes is what your CPA does with it: in a taxable account, the K-1 feeds your personal return directly; inside the IRA, it matters mainly if there is unrelated business taxable income, which you would see called out as UBTI on the K-1 itself. Passive lending interest is generally exempt from UBTI, so if the fund is making loans and not using significant leverage, you may owe nothing and the K-1 flows through the custodian for record-keeping only.

The right person to get on a call with is the fund's investor relations contact, not the custodian. Ask them specifically: what accounting basis does the fund use, does the K-1 reflect accrual or cash, and can they walk line by line through the variance from the deal deck projections. A fund of any quality should be able to do that. Your CPA needs that explanation from the fund accountant, since the custodian genuinely cannot provide it.

For sizing the second position, I would hold on that until you have a clear written answer from the fund on the accounting methodology. Once you understand what you are reading, the sizing question gets a lot easier.

What does the K-1 show in the UBTI section, if anything? That would help narrow down whether this is purely a timing presentation issue or something that needs more attention.

The K-1 inside an IRA is technically informational only since the income is not taxable at the entity level until distribution, but that does not mean the numbers should be unreconcilable. What trips people up is that some bridge funds issue K-1s on a calendar basis and accrue interest that has not actually moved yet, so your twelve months of capital might have three or four accrual periods sitting in the document that do not line up with the deal deck waterfall at all. I had a similar situation on a land fund years ago, not a bridge product, but the sponsor eventually had to send a supplemental schedule showing the accrual-to-cash bridge line by line before anything made sense. Your CPA not knowing SDIRA K-1s is not the problem here, the problem is that nobody has given you the reconciliation work that should have come with the K-1 in the first place.

What I would want before putting another dollar in is the fund's actual accounting basis election, whether it filed as cash or accrual with the IRS, and then a side-by-side of the two K-1s against the capital account statement the custodian should be holding. The custodian not adding commentary is normal and honestly expected, they are not reviewing the economics, they are just holding the asset. But the sponsor should be able to produce a capital account reconciliation that shows your opening balance, contributions, income allocated, distributions paid, and closing balance, and if those four lines do not foot to what is on the K-1, that is a fund accounting error and not a timing issue. Sizing a second position before that document exists in your hand seems like the thing to not do.