| # | Id | Type | Description |
| 1 | finalK1 | boolean | Final K-1 |
| 2 | amendedK1 | boolean | Amended K-1 |
| 3 | fiscalYearBegin | DateString | |
| 4 | fiscalYearEnd | DateString | |
| 5 | irsCenter | string | Box C, IRS Center where corporation filed return |
| 6 | corporationBeginningShares | number | Box D, Corporation's total number of shares, Beginning of tax year |
| 7 | corporationEndingShares | number | Box D, Corporation's total number of shares, End of tax year |
| 8 | disregardedEntityTin | string | Box F2, Disregarded entity shareholder's TIN, if applicable |
| 9 | disregardedEntityName | string | Box F2, Disregarded entity shareholder's Name, if applicable |
| 10 | entityType | string | Box F3, What type of entity is this shareholder? |
| 11 | percentOwnership | number (double) | Box G, Current year allocation percentage |
| 12 | beginningShares | number | Box H, Shareholder's number of shares, Beginning of tax year |
| 13 | endingShares | number | Box H, Shareholder's number of shares, End of tax year |
| 14 | beginningLoans | number | Box I, Loans from shareholder, Beginning of tax year |
| 15 | endingLoans | number | Box I, Loans from shareholder, Ending of tax year |
| 16 | ordinaryIncome | number | Box 1, Ordinary business income (loss) |
| 17 | netRentalRealEstateIncome | number | Box 2, Net rental real estate income (loss) |
| 18 | otherRentalIncome | number | Box 3, Other net rental income (loss) |
| 19 | interestIncome | number | Box 4, Interest income |
| 20 | ordinaryDividends | number | Box 5a, Ordinary dividends |
| 21 | qualifiedDividends | number | Box 5b, Qualified dividends |
| 22 | royalties | number | Box 6, Royalties |
| 23 | netShortTermGain | number | Box 7, Net short-term capital gain (loss) |
| 24 | netLongTermGain | number | Box 8a, Net long-term capital gain (loss) |
| 25 | collectiblesGain | number | Box 8b, Collectibles (28%) gain (loss) |
| 26 | unrecaptured1250Gain | number | Box 8c, Unrecaptured section 1250 gain |
| 27 | net1231Gain | number | Box 9, Net section 1231 gain (loss) |
| 28 | otherIncome | Array of CodeAmount | Box 10, Other income (loss) |
| 29 | section179Deduction | number | Box 11, Section 179 deduction |
| 30 | otherDeductions | Array of CodeAmount | Box 12, Other deductions |
| 31 | credits | Array of CodeAmount | Box 13, Credits |
| 32 | scheduleK3 | boolean | Box 14, Schedule K-3 is attached |
| 33 | amtItems | Array of CodeAmount | Box 15, Alternative minimum tax (AMT) items |
| 34 | basisItems | Array of CodeAmount | Box 16, Items affecting shareholder basis |
| 35 | otherInfo | Array of CodeAmount | Box 17, Other information |
| 36 | multipleAtRiskActivities | boolean | Box 18, More than one activity for at-risk purposes |
| 37 | multiplePassiveActivities | boolean | Box 19, More than one activity for passive activity purposes |
| 38 | k1Supplemental | K1Supplemental | |
| 39 | k1StatementA | K1StatementA | |
| 40 | k1StatementC | K1StatementC | |