Partnership & International Tax Intelligence Suite

End-to-End
Subchapter K Workflow

From trial balance ingestion to K-1 issuance — SubK-OS is a full-suite platform for tax professionals navigating multi-entity partnerships, §704(b)/(c), §754 elections, and Schedule K-1 compliance.

Build Progress 0%

6 of 13 modules in active development — early access now available

Partnership Tax Suite

📁

Setup & Import

Ingest multi-entity CSV trial balances (current + prior year), set reviewer context, and kick off the standardization workflow.

Alpha
📊

Portfolio Dashboard

Multi-entity overview with mapping progress, balance status, and consistency checks across the full portfolio.

Alpha
🔗

Mapping Desk

Map TB accounts to Schedule K line items with AI assist, firm dictionary rules, and auto-map across entities.

Alpha
📄

Tax Basis & M-3

Generate tax basis trial balances and M-3 book-to-tax reconciliations from fully mapped entity data.

Building
⚖️

Partner Allocations

Compute §704(b) substantial economic effect allocations, guaranteed payments, and special profit/loss splits.

Building
🔥

§704(c) Overlays

Identify contributed property with built-in gain/loss and apply traditional, curative, or remedial allocation methods.

Building
🔁

§754 / §743(b)

Calculate inside basis adjustments upon partner transfers or liquidations under §754 elections and §743(b).

Building

Review & K-1

Validate Schedule K-1 packages for completeness, line-item consistency, and compliance before filing.

Building
🕐

Prior Year Variance

Side-by-side current vs. prior year comparison with large variance flags, new accounts, and dropped account detection.

Alpha

Additional Modules

🗂️

Tax Administrator Suite

Centralized admin layer for managing entities, filing calendars, due dates, and preparer assignments across the portfolio.

Coming Soon
🌐

PFIC Testing

Test foreign corporations for Passive Foreign Investment Company status using income and asset tests under §1297.

Coming Soon
📈

§1291 Excess Distribution

Calculate excess distributions and disposition gains from PFIC investments, including interest charge and look-back period allocations.

Coming Soon
🔍

Tax Doc Viewer

Upload, review, and annotate tax documents — K-1s, returns, schedules — with inline commenting and cross-reference linking.

Building

Status Key

Alpha — Limited Access Building — Active Dev Coming Soon — Planned

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