The Valleys of Thornhill
The Valleys of Thornhill
Pre-Construction Assignment Sales in Ontario: What You Need to Know
Investment7 min readSeptember 18, 2026

Pre-Construction Assignment Sales in Ontario: What You Need to Know

An assignment sale lets you sell your pre-construction contract before closing. Learn how they work in Ontario, what fees to expect, and the tax implications involved.

What Is an Assignment Sale?

An assignment sale occurs when the original buyer of a pre-construction home sells their purchase agreement to a new buyer before the home is completed and final closing takes place. The original buyer (the assignor) transfers their rights and obligations under the Agreement of Purchase and Sale to a new buyer (the assignee), who then completes the purchase directly with the builder.

Assignment sales are a common feature of the Ontario pre-construction market, particularly in the Greater Toronto Area where demand for new housing often exceeds initial allocations. For buyers who purchased early in a project's lifecycle, an assignment can represent an opportunity to realize gains if property values have increased between the time of purchase and the expected completion date.

How Do Assignment Sales Work?

The mechanics of an assignment sale involve several steps and multiple parties. Understanding the process helps both assignors and assignees navigate the transaction smoothly.

Step 1: Review Your Agreement

Not all pre-construction purchase agreements permit assignment sales. Before proceeding, you must review your Agreement of Purchase and Sale to determine whether assignment is allowed and under what conditions. Many builders include specific clauses governing assignments, including:

  • Whether the builder's written consent is required (it almost always is)
  • Any fees the builder charges for processing the assignment
  • Restrictions on when an assignment can occur (some builders prohibit assignments until a certain construction milestone is reached)
  • Requirements for the assignee to meet the same qualification standards as the original buyer

Step 2: Obtain Builder Consent

Even if your agreement permits assignments, most builders require formal written consent before the assignment can proceed. The builder may charge an assignment fee, which typically ranges from $5,000 to $10,000 or a percentage of the purchase price. This fee is separate from any real estate commissions or legal fees.

Step 3: Find a Buyer

The assignor is responsible for finding the assignee. This is typically done through a real estate agent who specializes in assignment sales, though some transactions occur privately. The assignment price includes the original purchase price plus whatever premium the assignor is seeking.

Step 4: Execute the Assignment Agreement

An assignment agreement is a separate contract between the assignor and the assignee. This document outlines the terms of the assignment, including the price, the deposits being transferred, and the obligations the assignee is assuming. Both parties should have independent legal representation for this step.

Step 5: Complete the Original Purchase

After the assignment is executed, the assignee steps into the shoes of the original buyer. They are responsible for all remaining payments to the builder, including any outstanding deposit installments and the balance due at final closing.

Costs Involved in an Assignment Sale

Assignment sales involve several layers of costs that both parties need to understand before entering the transaction.

For the Assignor (Original Buyer)

  • Builder's assignment fee: $5,000 to $10,000 or more, depending on the builder
  • Real estate commission: If using an agent to find the assignee, typically 2-5% of the assignment price
  • Legal fees: For the assignment agreement and any related documentation
  • HST on the profit: The assignment profit may be subject to HST (see tax section below)
  • Income tax: The profit from an assignment sale is taxable income

For the Assignee (New Buyer)

  • Assignment premium: The amount above the original purchase price that the assignor is charging
  • Deposits already paid: The assignee must reimburse the assignor for deposits already submitted to the builder
  • Remaining deposits and balance: All future payments to the builder become the assignee's responsibility
  • Legal fees: For reviewing the original agreement, the assignment agreement, and closing documentation
  • Land transfer tax: Paid at final closing, calculated on the original purchase price (not the assignment price)

Tax Implications of Assignment Sales

The tax treatment of assignment sales is one of the most important and often misunderstood aspects of the process. Both assignors and assignees should consult with a tax professional before proceeding.

HST Considerations

The Canada Revenue Agency (CRA) considers the assignment of a purchase agreement to be a taxable supply. This means that HST may be applicable on the profit portion of the assignment. The CRA has been increasingly focused on ensuring that assignment sale profits are properly reported and taxed.

If the assignor purchased the home with the intention of living in it (as their primary residence), the tax treatment may differ from a situation where the home was purchased as an investment from the outset. However, the CRA looks at the actual circumstances of each case, and simply stating an intention to live in the home is not sufficient to avoid tax obligations.

Income Tax

The profit from an assignment sale is generally treated as business income rather than a capital gain. This distinction is significant because business income is fully taxable at your marginal tax rate, whereas only 50% of a capital gain is included in taxable income. The CRA typically considers pre-construction assignment profits to be business income because the property was acquired and disposed of before the buyer ever took possession.

When Does an Assignment Sale Make Sense?

There are several scenarios where an assignment sale may be the right choice:

  • Changed circumstances: Job relocation, family changes, or financial shifts that make the original purchase no longer suitable
  • Market appreciation: Significant price increases since the original purchase create an opportunity to realize a profit
  • Investment strategy: Some investors specifically target early-phase pre-construction purchases with the intention of assigning before closing
  • Unable to close: If you are unable to secure financing or meet the closing requirements, an assignment may be preferable to defaulting on the agreement

Risks and Considerations

Assignment sales are not without risk, and both parties should consider the following:

  • Builder restrictions: The builder can refuse consent, particularly if the assignee does not meet their qualification criteria
  • Market conditions: If the market softens between purchase and attempted assignment, you may not be able to assign at a premium
  • Tax exposure: The tax consequences can significantly reduce the net profit from an assignment
  • Assignee risk: As an assignee, you are inheriting a contract that you did not negotiate, including any upgrades, changes, or issues that occurred before the assignment
  • Timeline uncertainty: Pre-construction timelines can shift, affecting both the holding period and the closing date

Assignment Sales in the GTA Market

The Greater Toronto Area, including Vaughan and York Region, has an active assignment market driven by strong demand for new housing and limited supply. Communities in growing areas often see price appreciation between launch and completion, creating assignment opportunities for early buyers.

However, it is important to approach assignment sales with realistic expectations and proper professional advice. Working with a real estate agent experienced in assignments, a real estate lawyer who understands the documentation, and a tax professional who can advise on your specific situation will help you navigate the process effectively.

Whether you are considering purchasing a pre-construction home in a community like The Valleys of Thornhill with the flexibility of a future assignment in mind, or you are looking at an assignment purchase as a way to enter a sold-out project, understanding the mechanics, costs, and tax implications is essential to making an informed decision.

Have Questions About Pre-Construction?

Matthew Caporiccio can help you understand pricing, deposit structures, and availability at The Valleys of Thornhill and other pre-construction projects across the GTA.