ADU added to a rental: Cost-pool reconciliation exercise
Reconcile a proposed study total with the source cost file. An accessory unit may share services with an existing rental. Reconcile new construction and allocated shared costs without counting the same system in both buildings.
Preparation resource. Record completion does not determine eligibility, deductions or tax savings. Ask your qualified tax professional to resolve the facts and applicable rules.
What this file should establish
Enter the supported starting pool, separately identified items and adjustments accepted for review. Calculate the difference against the draft report. The exercise checks arithmetic and record completeness, not whether an allocation is legally correct.
An accessory unit may share services with an existing rental. Reconcile new construction and allocated shared costs without counting the same system in both buildings.
A situation to work through
A backyard unit connects to the main house's water and electrical service.
For this situation, start with ADU plans. Identify the period and legal owner before combining it with the other records. Keep the original source and explain any adjustments in a separate reconciliation.
Review point
Specifically review the risk of duplicating shared utility costs across two studies.
The draft total exceeds or falls short of the reconciled source pool.
Question for the reviewer
Which adjustments explain the report difference and who approves them?
Expected handoff
A source-to-report difference register.
Separate facts supported by documents from estimates and unresolved assumptions. Assign each missing item to a responsible person and a date. Send the reconciliation alongside the source references so the reviewer can trace each conclusion.
Your preparation worksheet
Enter a reference to the document, the person who can supply it and the unresolved question. Use file names or locations rather than account numbers or other sensitive information. Entries stay in this page until you close or refresh it. They are not sent to us or saved automatically. Export before leaving.
Record or decision
Source reference
Status
Responsible person
Open question
ADU plans
permits
contractor costs
utility routes
and completion records
starting cost pool
separate items
adjustments
report total
difference explanation
Mark not applicable only after noting why. A collected record can still require correction. Review the exported file before sharing it with your adviser.
Use the following primary guidance to frame the questions. The worksheet organizes facts; it does not replace analysis of the relevant year, ownership, elections or state treatment. Record the applicable period, confirm the source version and retain the preparer's written conclusions with the supporting documents.