Investing Tools
Practical calculators that help with real investing decisions. Each tool states its assumptions plainly and is meant as a planning aid, not financial advice.
Build a plan before picking products
Start with the target, test the compounding path, translate it into real value, then see what the portfolio must support later.
Turn headline returns into usable money
Check FX costs, product fees, annual tax drag, interest statements, broker basis records, wash sale constraints, dividend tax statements, and purchasing power before treating a return number as spendable wealth.
Run the foreign-investor tax workflow
Check the treaty-rate claim, confirm dividend withholding documentation, reconcile the tax statement, check any Form 1040-NR refund question, then review estate-tax administration before modeling after-tax results.
Keep risk from becoming accidental
Size the position, quantify idle-cash drag, rebalance the portfolio, and estimate the recovery path.
Check the account before moving money
Verify registration, investor-protection scope, broker fit, currency costs, and recurring fees before funding an account.
Build a long-term plan
Start with the target, time horizon, and compounding assumptions.
Compound Interest Calculator
Project how an investment grows with monthly contributions and compounding, and see how much of the balance is growth versus what you put in.
Investment Goal Calculator
Work backward from a target portfolio value to the monthly investment needed, using your current balance, time horizon, and return assumption.
Retirement Withdrawal Calculator
Test whether a portfolio can support an inflation-adjusted annual withdrawal, and see the starting withdrawal rate, modeled depletion year, and final balance.
Dividend Reinvestment (DRIP) Calculator
Compare reinvesting dividends versus taking cash over time, with dividend growth and share-price growth built in.
CAGR Calculator (Annualized Return)
Turn a starting value, ending value, and holding period into the compound annual growth rate that compares investments on equal terms.
Measure real after-cost returns
Translate headline returns into after-fee and purchasing-power terms.
Investment Fee Drag Calculator
See how much a fund's expense ratio or advisory fee quietly costs you over decades — the same return, with and without the fee.
FX Fee Drag Calculator
Estimate how currency conversion spreads and fixed transfer fees reduce a cross-currency investing plan over time.
Cash Drag Calculator
Estimate how a cash allocation changes long-term portfolio value versus a fully invested baseline.
Real Return Calculator
Convert a headline nominal return into after-fee, inflation-adjusted purchasing power so goals are measured in real value, not just account dollars.
Investment Tax Drag Calculator
Estimate how annual taxes on realized returns reduce taxable-account compounding versus a no-tax benchmark.
Wash Sale Rule Checklist
Check the 30-day replacement window, substantially identical exposure, broker reporting, and Form 8949 code W before modeling a harvested loss.
Form 1099-B Cost Basis Checklist
Reconcile broker proceeds, covered-security status, cost basis, wash sale box 1g, and Form 8949 adjustments before using tax data in a model.
Form 8949 Capital Gains Adjustment Checklist
Reconcile proceeds, basis, short-term and long-term boxes, adjustment codes, wash sale code W, and Schedule D carryover before modeling capital gains.
Form 1099-DIV Dividend Income Checklist
Reconcile ordinary dividends, qualified dividends, capital gain distributions, backup withholding, and foreign tax before using dividend tax data in a model.
Form 1099-INT Interest Income Checklist
Reconcile interest income, Treasury interest, backup withholding, foreign tax, tax-exempt interest, and Schedule B triggers before using cash-yield data in a model.
Form 1099-OID Original Issue Discount Checklist
Reconcile original issue discount, Treasury OID, acquisition premium, market discount, tax-exempt OID, and Schedule B treatment before modeling bond income.
W-8BEN Dividend Withholding Checklist
Check W-8BEN status, treaty claims, and U.S. dividend withholding before treating a dividend yield as after-tax cash.
U.S. Dividend Tax Treaty Rate Checklist
Check the dividend treaty-rate claim, treaty table, W-8BEN documentation, and Form 1042-S reporting path before modeling a lower withholding rate.
Form 1042-S Dividend Tax Statement
Reconcile U.S. dividend income, withholding, and treaty reporting before using broker tax forms in an after-tax model.
Form 1040-NR Dividend Withholding Refund Checklist
Reconcile Form 1042-S withholding, treaty assumptions, and Form 1040-NR filing scope before treating a refund as cash.
Control position and portfolio risk
Size trades, rebalance allocations, and estimate recovery paths.
Dollar-Cost Averaging Calculator
See how buying more shares at a new price changes your average cost, total shares, break-even level, and cost basis.
Portfolio Rebalancing Calculator
Calculate how much to buy or sell to bring your portfolio back to a target risk-asset weight after market moves or new cash.
Drawdown Recovery Calculator
Translate a portfolio loss into the gain needed to break even and the rough recovery time with or without monthly contributions.
Position Size Calculator (Risk-Based)
Size a trade from your account, the risk you'll take per trade, and your entry and stop — so every position's downside is fixed.
Choose the account wrapper
Check broker and account-fit decisions before moving money.
How to Choose a US Stock Broker (2026)
A decision framework plus a side-by-side comparison of the major US brokers — now that commissions are $0, what actually separates them.
Broker Safety Checklist
Check FINRA records, SIPC membership, fee paths, and fraud red flags before opening or funding a brokerage account.
Form 10-K Annual Report Checklist
Read annual reports by business model, risk factors, MD&A, audited statements, filing status, and later EDGAR updates before treating a 10-K as a thesis.
Form 10-Q Quarterly Report Checklist
Read quarterly reports by unaudited statements, MD&A, filing deadlines, amendments, and later 8-Ks before treating a 10-Q as thesis evidence.
Form 12b-25 Late Filing Notice Checklist
Read NT 10-K and NT 10-Q late-filing notices by missing report, one-business-day timing, 5-day or 15-day window, narrative reason, and later EDGAR filing.
Form 25 Delisting Notice Checklist
Read exchange delisting and Section 12(b) withdrawal notices by filer, rule box, public notice, 10-day listing removal, 90-day registration withdrawal, and later EDGAR filings.
Form S-1 IPO Registration Checklist
Read IPO registration statements by prospectus scope, risk factors, use of proceeds, dilution, selling holders, and audited financials before treating an S-1 as evidence.
Form S-4 Merger Registration Checklist
Read merger registration statements by proxy/prospectus status, consideration, vote mechanics, appraisal rights, regulatory approvals, and amendments.
Form 20-F Foreign Issuer Annual Report Checklist
Read foreign issuer annual reports by FPI status, filing deadline, operating review, accounting basis, governance, and later 6-K follow-through.
Form 6-K Foreign Issuer Report Checklist
Read foreign issuer interim reports by home-country source, exchange disclosure, attached exhibits, financial-statement context, and 20-F follow-through.
Schedule 14A Proxy Statement Checklist
Read DEF 14A proxy statements by meeting agenda, voting matters, executive pay, ownership, preliminary versus definitive status, and merger context.
Schedule TO Tender Offer Checklist
Read tender-offer filings by bidder identity, offer terms, funding, conditions, amendments, and final results before treating a headline offer price as evidence.
Schedule 14D-9 Tender Offer Response Checklist
Read the target company's tender-offer response by recommendation, neutrality, conflicts, retained advisors, exhibits, and later amendments.
Schedule 13E-3 Going-Private Checklist
Read going-private transaction statements by filing persons, purpose, alternatives, fairness, outside reports, funding, and amendments.
Form 13F Institutional Holdings Checklist
Read institutional holdings filings with the right delay, security-universe, EDGAR, and data-quality checks before treating a position as a stock idea.
Form 8-K Material Event Checklist
Read current reports by event date, item number, filed-versus-furnished status, exhibits, and EDGAR follow-through before treating an 8-K as a signal.
Form 3 Initial Insider Ownership Checklist
Check an insider's initial beneficial ownership baseline, direct versus indirect holdings, derivative securities, and future Form 4/Form 5 follow-through.
Form 4 Insider Transaction Checklist
Read insider transaction filings by reporter, date, transaction code, 10b5-1 plan context, and EDGAR verification before treating the filing as a signal.
Form 5 Annual Insider Ownership Checklist
Read annual insider ownership filings by fiscal year, delayed or exempt reports, transaction codes, direct versus indirect holdings, and derivative tables.
Form 144 Affiliate Sale Notice Checklist
Read proposed affiliate sale notices by Rule 144 threshold, issuer status, broker mechanics, amount, market value, recent sales, and later execution filings.
Schedule 13D/G Beneficial Ownership Checklist
Check 5% beneficial ownership, 13D versus 13G status, filing deadlines, amendments, and EDGAR context before treating a large-holder filing as a signal.
Cash vs Margin Account Checklist
Decide whether a cash account or margin account fits your brokerage workflow before borrowing permissions change the risk profile.
Cash Sweep Programs Checklist
Check where idle brokerage cash sits, what it earns, and whether FDIC, SIPC, or fund rules apply.
U.S. Estate Tax Checklist for Nonresident Investors
Check U.S.-situated assets, the $60,000 Form 706-NA filing trigger, treaty caveats, and transfer-certificate friction before treating a U.S. brokerage account as simple.
IRA Contribution and Form 5498 Checklist
Check 2026 IRA limits, taxable compensation, Roth phase-outs, traditional IRA deductibility, Form 5498 boxes, and excess-contribution risk before modeling retirement-account contributions.
Tool FAQ
Which calculator should I start with?
Start with the investment goal calculator if you have a target value, the real-return calculator if you are comparing return assumptions, and the position-size or rebalancing calculators if the decision is about risk control.
Are these calculators investment advice?
No. They are planning models with simplified assumptions. Each tool states what it excludes, and the output should be checked against the source-backed research and a professional plan before any real-money decision.
Why link calculators back to research hubs?
A calculator can make a number look precise even when the inputs are uncertain. The evidence links keep the output connected to filings, market context, account rules, and risk limits.
Read the evidence before using a calculator
These research tracks keep the tools tied to filings, risk context, and account-level decisions.
Filing Workflow and Investor Safety
A cluster for checking filings, AI research tools, broker safety, and the basic workflow before buying a US stock.
Macro Risk, Sector Rotation, and Trading Vehicles
A cluster for connecting Fed timing, sector rotation, inverse ETFs, mega-cap cash return, IPO disclosure, and market narrative risk.
AI Capex, Cloud, and Semiconductor Evidence
A cluster for reading AI infrastructure spending through cash flow, cloud margins, chip demand, and data-center timing.