Portfolio Personal Rate of Return Calculator Tool (Estimate)

Fixed for 2026. I initially wrote this calculator in 2007. Hey, at least you know it wasn’t AI! Some of you may be wondering how well your specific portfolio performed last year (or over any specific period of time). Let’s say you started the year with $10,000 and put in another $5,000 through 10 different deposits spaced throughout the year, and ended up with $16,000. What was your rate of return? Your main goal is simply to separate the effect of new deposits (or withdrawals) and your actual return from investments.

Figuring out your exact personal rate of return requires you to know the exact dates of all your deposits and withdrawals, along with a financial calculator or spreadsheet program with an IRR function (example here). However, for a quick and simple estimate of your returns, try this calculator instead:

Initial Balance: $
Total Deposits: $
Total Withdrawals: $
Final Balance: $
Time period:   year(s)
Your estimated annualized rate of return:   %

Instructions

  1. Get your initial balance. This is probably from your brokerage statements. Try January of last year.
  2. Tally up any deposits or withdrawals. For example, let’s say you know you put $3,000 in your Roth IRA and also 5% of your $40,000 salary into a 401(k). That would be $3,000 + $2,000 = $5,000. That’s it, you don’t need to worry about looking up the specific dates and amounts.
  3. Get your final balance. Your December statement is probably available already.
  4. Find the time elapsed (in years) between your initial and final balances.
  5. Hit Calculate. An estimate of your annualized return is instantly given.

How Accurate Is This Estimate?
The calculator assumes that the inflows and outflows are spread evenly around the middle of the year. I originally saw this method in the book The Four Pillars of Investing (review). However, unless the deposits and withdrawals are very large as compared to the initial balance, the estimates are actually pretty good.

For example, let’s say that you start with $100,000 on 1/1/2025, and end up with $120,000 on 1/1/2026. If you had net deposits of $10,000 during the year, the calculator above would estimate your return at 9.52%. If the $10,000 was actually deposited all at once on one of these specific days, you would get the following exact returns:

Deposit Date Exact Return
1/1/2025 (very first day) 9.1%
6/04/2025 (middle of the year) 9.5%
1/1/2026 (very last day) 10%
Estimate 9.5%

 

Also check out the rest of my Tools and Calculators.

MVNO Cellular Data Priority Comparison (Why I Switched to US Mobile)

I haven’t paid “full price” for a cellular phone plan for decades, but that doesn’t mean there haven’t been any trade-offs. Mobile Virtual Network Operators (MVNOs) buy network capacity in bulk from major carriers (MNOs like T-Mobile, Verizon, AT&T) and resell them to individual customers. For a while, the main trade-off for going with an MVNO (which buys bulk minutes and data from the major carriers) was slightly worse cellular coverage due to a lack of roaming agreements with other carriers. If you were on a AT&T MVNO, you could only use AT&T cell towers.

These days, the primary catch is data de-prioritization. To manage the demand, there are different Quality of Service Class Identifiers (QCI levels) that have different priorities on the network. In areas where there are a lot of people, especially things like concerts and sporting events, there is a lot of demand and those not at the front of the line will notice slow or no data.

This r/NoContract Reddit post provides an excellent collection of the data prioritization policies of the major carriers. It’s still a lot, so I have attempted to summarize everything below as much as possible.

For Verizon, QCI 8 is the highest priority level for consumers. Includes:

  • All Verizon Postpaid “Traditional” plans (except “Welcome”).
  • Visible+ and Visible+ Pro (owned by Verizon).
  • Total Wireless’ Total 5G Unlimited and Total 5G+ Unlimited (owned by Verizon).
  • Xfinity Mobile and Spectrum Mobile (owned by cable companies).
  • US Mobile Unlimited Premium “Warp” (*for 5G w/ Premium Only)

QCI 9 is a step lower, the base tier. Includes:

  • Verizon’s Unlimited Welcome plan (their most basic plan)
  • Visible Base plan
  • US Mobile Unlimited Starter “Warp” and other Warp plans.
  • All other Verizon prepaid MVNOs.

For AT&T, QCI 7 is the highest priority level for consumers. Includes:

  • Select AT&T Plans with special “Turbo” data.

QCI 8 is a step lower, but still considered higher priority. Includes:

  • Select AT&T Plans with “Extra/Premium/Max” data.
  • Cricket Supreme Unlimited, Cricket Sensible 10GB plans (*owned by AT&T)
  • H2o, Consumer Cellular, and PureTalk MVNOs.
  • US Mobile Unlimited Premium “Dark Star” (*Premium Only)

QCI 6 is another step lower, the base tier. Includes:

  • AT&T base Unlimited plans for both AT&T postpaid and AT&T Prepaid.
  • All other AT&T plans once the “Turbo/Premium” data is used up.
  • Cricket Select Unlimited, Cricket Smart Unlimited plans (*owned by AT&T)
  • US Mobile Unlimited Starter “Dark Star” and other Dark Star plans.
  • All other AT&T prepaid MVNOs.

For T-Mobile, QCI 6 is the highest priority level for consumers. Includes:

  • All T-Mobile Postpaid and Prepaid plans (except “Essentials”)
  • Google Fi

QCI 7 is a step lower, the base tier. Includes:

  • T-Mobile Essentials plans (their most basic plan)
  • All other T-Mobile prepaid MVNOs, including Metro and Mint Mobile (both owned by T-Mobile).

Long-time readers will know that I was with Mint Mobile for a long time. I didn’t need much data back then. But each year, I felt the low priority of Mint Mobile data became more and more noticeable. Anywhere crowded, even an airport, and things would slow down significantly. Oftentimes, I basically had no data at all, which was very frustrating when just trying to call up an Uber. T-Mobile sells a lot of data to MVNOs, so perhaps that’s another reason. I first tried to jump ship to Visible, but they messed up my number port so badly that I couldn’t get 2FA verification codes for days so I quickly switched back to Mint Mobile.

Late last year, after a positive experience with US Mobile’s customer service involving their Apple Watch plans, I decided to switch to US Mobile’s Unlimited Premium plan which offers “Priority Data” on their Warp (Verizon) and Dark Star (AT&T) plans. They run a lot of promotions (often extending them over and over) but I jumped on the Warp plan with Unlimited Premium because it also included a free Apple Watch cellular plan. I’m paying a bit more than I used to with Mint Mobile, but I’ve definitely noticed the improvement in data quality. My number port was nearly instant. With their Unlimited Premium plan, I can even switch between networks for free if one place has better coverage, allowing me access to AT&T and T-Mobile towers.

I am happy with US Mobile as I now have high data speeds, multi-network coverage, reasonable cost, and decent customer service.

The current US Winter Phone Deal is on Dark Star (AT&T). Unlimited Starter for $119/year prepaid upfront ($9.92/mo) for the first year (regular data priority) with promo code WINTER119 and Unlimited Premium for $149/year prepaid upfront ($12.42/mo) for the first year (which offers higher data priority and other perks) with promo code WINTER149. Port-in required. There are also some big discounts on the latest Google Pixel 10 phones and Samsung Galaxy S25 Edge if you scroll down. Starts 1/28 at 11am ET through 1/31.

You can stack the current promo with my referral link to get an additional $25 off:

To qualify for the $25 referral bonus, you must maintain active paid service in good standing for 6 months, port in a new line, and spend a total of $100 on Unlimited, By the Gig, or Smartwatch plans — Other plans, top-ups, devices, add-ons, roaming, and certain promotions (listed at usmobile.com/promo-archive) are excluded. Annual plans will be prorated monthly (e.g. $228 equals $114 after 6 months).

If you want a deal on Verizon (Warp), I’d just wait around for a bit. However, it probably won’t ever be as cheap as this Dark Star (AT&T) deal. I paid $299 for a year of Unlimited Premium (includes Priority Data and Apple Watch cellular plan) during a previous sale. Full price at renewal will be $390/year ($32.50/month), which is still much cheaper than any traditional major carrier plan after you add taxes/fees and $10/month for the Apple Watch add-on.

Callan Periodic Table of Investment Returns 2025 Year-End Update

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Big List of Free Consumer Data Reports 2026: Check Your Credit, Banking, Rental History, Insurance, and Employment Data

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IRS Identity Protection PIN Reminder: Prevent Tax Return Scams

Reminder for new tax season. Identity Protection PINs (IP PIN) have been updated for 2026 (they are updated every January). An important "hardening" tactic against identity theft is to obtain an Identity Protection PIN (IP PIN) from the IRS. The … [Read the rest]

Apple Watch Standalone Phone on US Mobile Review

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Navy Federal CU Specials: 13-Month CD at 4.00% APY w/ Add-On Feature

Updated January 2026. Navy Federal Credit Union is the nation's largest credit union, with a long history of serving active military members. More recently, they have expanded their field of membership to include veterans and family members of … [Read the rest]

Chase MyBonus 2026 Q1: Targeted 5X Points on Gas/Groceries/Restaurants

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MMB Portfolio Dividend & Interest Income – 2025 Year End Update

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Best Interest Rates Survey: Bank Accounts, Treasury Bills, Money Markets, ETFs – January 2026

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MMB Portfolio Asset Allocation & Performance – 2025 Year End Update

Here is my 2025 Year-End portfolio update that includes all our combined 401k/403b/IRAs and taxable brokerage accounts but excludes our house and small side portfolio of self-directed investments. Following the concept of skin in the game, the … [Read the rest]