5 Tax-Loss Harvesting Tools for a Year-End Portfolio Review

Updated September 26, 2026.

For a year-end tax-loss review, start by deciding who will do the work. Mezzi can help you examine a potential decision across connected accounts. Wealthfront, Betterment, Parametric, and Schwab Intelligent Portfolios offer forms of managed investing that can include tax-loss harvesting, subject to eligibility and service terms.

A December review is useful, but harvesting is not inherently a December-only activity. Opportunities depend on losses and circumstances, not the calendar alone. Software also cannot turn every decline into a valid deduction. The relevant account, transaction history, replacement purchase, and household activity all matter.

Method: Mezzi publishes this comparison. We reviewed official product documents on September 26, 2026. We did not open matched accounts or test tax outcomes. This is a comparison of documented services and a practical review process, not a prediction of savings. Algorithmic management and conversational AI are distinguished throughout.

Five services, five different responsibilities

A general balance sheet can support organization without offering specialist harvesting. This shortlist focuses on documented guidance or managed harvesting services.

1. Mezzi: prepare a decision across accounts you already use

Mezzi can bring investments, banking, other assets, and liabilities into one financial discussion. AI Personalization lets you retain relevant goals and constraints. For a year-end review, that might include expected cash needs, known upcoming expenses, or restrictions you want considered before changing investments.

Its role is to help you reason through a decision. A loss may look attractive in one account while a purchase elsewhere creates a complication. Selling may also affect a concentration problem or a cash requirement. The question is broader than finding the largest red number in a portfolio.

What to verify: cost basis, acquisition dates, account type, relevant purchases, and whether the data is current. Mezzi's tax-lot update explains that available lots depend on the connection. A connected account should not be assumed to provide a complete transaction history or every detail needed for a tax conclusion.

A useful prompt: “Help me prepare a review of this potential loss. Separate the information you can see from what I must confirm, and consider my upcoming cash need and purchases in other accounts.” This is an evaluation example, not a claim of automatic household-wide certification.

Cost and boundary: Free provides an entry point; Advisory is $399 annually and Concierge is $999 annually. See current plans. Mezzi does not execute the sale, block outside purchases, file taxes, or guarantee that a wash sale will not occur. It fits an investor who wants guidance and is prepared to implement and verify the resulting action.

2. Wealthfront: a continuing managed process

Wealthfront documents checking eligible accounts for harvesting opportunities every trading day. This makes it a continuing managed process rather than simply a tool to open in December.

For someone who wants to delegate implementation, that distinction matters. The service manages the portfolio and carries out eligible transactions. Its tax-loss harvesting documentation explains the feature's operation within taxable managed accounts.

Wealthfront describes coordination across disclosed related accounts held with it, while making clients responsible for relevant outside-account purchases. Confirm which relationships are disclosed and do not assume a separate brokerage is covered by the managed service.

Year-end review: confirm the product you hold, the activity already completed, and any information about outside investments that needs attention. A person with another brokerage account or a spouse making independent purchases should not assume that all activity is controlled by one manager. Also check whether planned deposits, withdrawals, or transfers change the picture.

Cost: the standard Automated Investing advisory fee is 0.25% annually, with fund expenses additional. Different Wealthfront products can have different fees and eligibility. Its current investing overview and tax-management explanation help distinguish them.

Tradeoff: this can be a better fit than guidance-only software when you want portfolio management itself. It can be a poor reason to move an appreciated account in haste merely because the tax year is ending. Establish the treatment of transferred holdings and potential transition gains before committing.

3. Betterment: verify the feature and the account together

Betterment's tax features belong to its investment service. The appropriate question is whether your particular portfolio and account are eligible and configured for the feature, not whether the company generally uses automation.

The benefit of a managed workflow is that portfolio maintenance and implementation sit within the same service. If you would otherwise postpone every review, that can be relevant. But automation does not make the outcome independent of market movements, tax circumstances, or activity at other institutions.

Household coordination: Betterment's tax-loss harvesting disclosure says external accounts can create wash sales even if they are linked in its dashboard. It also instructs customers to establish a taxpayer relationship for coordination with a spouse's Betterment accounts. Visibility, an established relationship, and trading control are different things; confirm the setup instead of assuming an external connection prevents a conflict.

Year-end review: inspect the account's settings and transaction record, clarify how the service handles coordination, and identify any outside purchases that deserve attention. Separate losses already realized from unrealized losses that remain on a screen. They do not have the same tax status.

Cost: current pricing starts at $5 monthly, switching to 0.25% annually with at least $200 in qualifying recurring monthly deposits or a qualifying $24,000 balance. Premium and higher-balance tiers have separate terms. Fund expenses are additional. Use the rate applicable to your account in a cost comparison.

Tradeoff: Betterment may fit someone seeking an ongoing managed investment service. If you want to retain control over an existing portfolio elsewhere, a guidance and review workflow may be more appropriate. The comparison is about responsibility as well as cost; neither model is inherently best for every household.

4. Parametric: a tailored tax-managed portfolio

Parametric's direct-indexing service uses individual securities to create customized exposure rather than relying only on a single pooled index fund. That structure can create security-level harvesting opportunities and accommodate restrictions.

The important distinction is the mandate. An investor with concentrated holdings, charitable plans, or investment exclusions may need a coordinated transition and ongoing tax budget. This is more involved than buying a general-purpose software subscription. The manager and the advisor relationship should be evaluated together.

Year-end review: discuss realized gains and losses to date, any remaining tax budget, restrictions on sales or replacements, and expected outside transactions. Ask how a proposed action changes portfolio exposure and how much deviation from the intended benchmark is acceptable. A tax objective should be considered alongside investment risk.

Cost and access: obtain the actual proposal for the chosen strategy, advisor arrangement, account size, and custody setup. The total may include more than one layer of fees. A generic price from another advisor's offer is not a reliable quote for your situation.

Tradeoff: customization may be valuable when the portfolio and tax circumstances justify it. It also adds complexity, individual holdings, and a need for coordination. Direct indexing does not guarantee positive tax value in every year, and a vendor's general research should not be read as a promised result for your account.

5. Schwab Intelligent Portfolios: check the harvesting threshold

Schwab Intelligent Portfolios offers automated portfolio management. Its documented harvesting feature is available for eligible taxable portfolios with at least $50,000, and clients must enroll. The minimum to open the broader service is $5,000, which is a different threshold.

That distinction is easy to miss in a comparison table. Someone with a $20,000 account may qualify for the investment service without qualifying for harvesting. A larger account may meet the balance requirement but still need the feature activated.

Year-end review: verify eligibility, enrollment, and completed transactions. Confirm the portfolio's cash allocation and how it relates to your overall financial plan. Tax features are one component of a managed portfolio, not a reason to ignore the rest of its construction.

Cost and tradeoff: Schwab describes no advisory fee for the standard service, but ETF expenses apply and the portfolio includes a cash allocation. Schwab explains that it earns revenue from the program, including cash-related arrangements. “No advisory fee” should not be rewritten as “no economic cost.”

This is a reasonable candidate for someone who wants the specific managed service and meets the harvesting requirements. It is not a substitute for reviewing the assets, accounts, and transactions the service does not manage.

The year-end review in a practical order

First, establish which losses are relevant

Start with taxable investment accounts and current institution records. Separate realized gains and losses from unrealized changes. Identify missing lots, transferred positions, and any basis information that needs correction. A sale decision built on an incorrect basis can be wrong before the tax analysis begins.

Then inspect the wash-sale window

The IRS describes wash-sale rules involving substantially identical securities purchased within 30 days before or after a loss sale. Certain related-account transactions can matter. A sale late in December can therefore create a review obligation that extends into January. IRS Publication 550

Include automatic reinvestments and recurring purchases in the review. Do not infer that a differently named fund is necessarily an acceptable replacement. The classification can require judgment, and the tool's data may not capture every relevant transaction.

Evaluate the replacement and the reason for selling

A tax loss is not the only consideration. Review exposure, liquidity, trading costs, and whether the replacement changes your intended investment mix. Avoid a trade whose only justification is the presence of a loss on a screen.

Carry the review into January

For a hypothetical December 20 loss sale, the 30-day period after the sale extends through January 19. A recurring purchase or dividend reinvestment in that interval can matter even though it occurs in a new calendar year. Review the 30 days before the sale as well. This calendar example illustrates the window; it does not establish whether any particular replacement is substantially identical.

Record the security, quantity, sale date, relevant prior purchases, scheduled future purchases, and the person checking each account. That record is more useful than a year-end reminder with no owner for the January follow-through.

Confirm implementation and keep the record

Identify who places the trade, which lot-selection instruction applies, and how you will verify execution. Keep the trade confirmations and later tax documents. A recommendation, an order, and a completed transaction are three different stages.

A simple example of value and cost

Suppose a hypothetical permitted $4,000 loss offsets gains taxed at an assumed 20% federal rate. That simplified current-year reduction is $800. It is not a $4,000 saving. The illustration omits state taxes, other tax rules, future gains, and the time value of deferral.

A 0.25% annual advisory fee on a constant $100,000 balance is approximately $250. Mezzi Advisory's annual subscription is $399. These services have different responsibilities, so this arithmetic is a budgeting comparison, not proof that one is better value. A year with no useful harvesting opportunity also does not eliminate the fee.

Frequently asked questions

Is December the best time to harvest losses?

There is no universally best month. A year-end review helps coordinate annual records, but losses and useful opportunities may arise throughout the year. Some managed services check regularly.

Can an AI tool prevent every wash sale?

No tool should be assumed to control every relevant purchase across an entire household. Data gaps, reinvestments, and outside transactions can matter. Confirm the service's scope and review the underlying records.

Why is a general wealth tracker not necessarily a harvesting tool?

Kubera's balance-sheet role is useful, but this shortlist focuses on harvesting guidance or managed harvesting. A service can be good at tracking wealth without being a specialist tax-loss tool.

Does a loss realized in December always belong on that year's return?

The treatment depends on applicable tax rules and the transaction. Verify dates, settlement-related issues where relevant, basis, and wash-sale adjustments with current records and tax guidance rather than relying on the month alone.