While other firms require thousands of dollars just to start, Fidelity’s revolutionary $0 minimum investment policy on their index funds fundamentally changed who can access professional portfolio management. This isn’t just marketing—it’s a structural advantage that allows investors to build properly diversified portfolios regardless of account size. After analyzing expense ratios, tracking error, and long-term performance, I can confirm that Fidelity’s index funds consistently compete with—and often surpass—their more expensive competitors.
Table of Contents
The Zero Minimum Revolution
- No initial investment requirements on most Fidelity index funds
- Fractional share investing allows complete allocation even with small contributions
- Automatic investment plans can start with as little as $10
- Zero expense ratios on several core funds
My Top Fidelity Index Funds for Minimal Investment
1. Fidelity ZERO Total Market Index Fund (FZROX)
- Expense Ratio: 0.00%
- Minimum Investment: $0
- Holdings: 2,600+ U.S. stocks
- Why It Leads: The first truly zero-cost total market fund. It tracks a proprietary index but has maintained near-perfect correlation with the CRSP US Total Market Index. For investors starting with small amounts, eliminating even a 0.03% expense ratio makes a meaningful difference over decades.
2. Fidelity ZERO International Index Fund (FZILX)
- Expense Ratio: 0.00%
- Minimum Investment: $0
- Holdings: 2,300+ international stocks
- Why It Shines: Provides instant diversification to developed and emerging markets without cost. While it excludes small-caps, the savings more than compensate for this slight coverage difference.
3. Fidelity U.S. Bond Index Fund (FXNAX)
- Expense Ratio: 0.025%
- Minimum Investment: $0
- Holdings: 8,800+ investment-grade bonds
- Why It Belongs: The cheapest total bond market fund available anywhere. Its 0.025% expense ratio is approximately half the cost of comparable Vanguard funds. For fixed income allocation, this is unquestionably the best option.
4. Fidelity ZERO Large Cap Index Fund (FNILX)
- Expense Ratio: 0.00%
- Minimum Investment: $0
- Holdings: 500+ large-cap stocks
- Why It Works: Essentially an S&P 500 fund without the licensing fees. It has outperformed the S&P 500 by 0.04% annually simply due to cost savings.
Performance Comparison: Fidelity Zero vs. Traditional Funds
| Fund | 5-Year Return | Expense Ratio | Minimum Investment |
|---|---|---|---|
| FZROX | 14.8% | 0.00% | $0 |
| VTSAX | 14.7% | 0.04% | $3,000 |
| FZILX | 7.1% | 0.00% | $0 |
| VTIAX | 7.0% | 0.11% | $3,000 |
| FXNAX | 1.2% | 0.025% | $0 |
| VBTLX | 1.1% | 0.05% | $3,000 |
Data as of December 2023; returns annualized
The Compound Math of Zero Fees
A $100 monthly investment in FZROX versus a fund with 0.04% expense ratio over 40 years:
FZROX Future Value:
FV = 100 \times \frac{(1 + 0.10)^{40} - 1}{0.10} = \$531,000Traditional Fund Future Value:
FV = 100 \times \frac{(1 + 0.0996)^{40} - 1}{0.0996} = \$526,500Difference:
\$531,000 - \$526,500 = \$4,500The 0.04% fee difference creates a $4,500 advantage despite identical pre-fee returns.
Portfolio Allocations for Various Account Sizes
Starter Portfolio ($100-$500)
- 70% FZROX
- 30% FZILX
Balanced Portfolio ($500-$5,000)
- 60% FZROX
- 20% FZILX
- 20% FXNAX
Complete Portfolio ($5,000+)
- 50% FZROX
- 20% FZILX
- 20% FXNAX
- 10% FNILX (for large-cap tilt)
Tax Efficiency Considerations
While Fidelity’s zero funds are excellent for tax-advantaged accounts, they use proprietary indexes that may generate slightly higher tracking error and potential tax inefficiencies compared to industry-standard indexes in taxable accounts. For taxable investing, consider:
- Fidelity Total Market Index Fund (FSKAX) – 0.015% expense ratio
- Fidelity Total International Index Fund (FTIHX) – 0.06% expense ratio
- Fidelity U.S. Bond Index Fund (FXNAX) – 0.025% expense ratio
These funds track standard indexes and may offer marginally better tax efficiency.
Automated Investment Strategies
Micro-Investing Approach
- Set up automatic $10 daily investments
- Allocate 70% to FZROX, 30% to FZILX
- Rebalance with new contributions
Round-Up Program
- Link Fidelity Bloom® app to checking account
- Invest round-ups from everyday purchases
- Automatically allocate across zero funds
The Hidden Cost of Minimum Investments
Traditional fund minimums create opportunity cost. While saving $3,000 for VTSAX, an investor misses approximately:
Opportunity Cost = 3000 \times (1.10^{\frac{2}{12}} - 1) = \$48Plus 6-24 months of lost compounding time.
Institutional-Class Performance for All
Fidelity’s index funds achieve institutional-level pricing through massive scale:
- $500 billion+ in index assets under management
- Securities lending revenue offsets costs
- Trading efficiency from volume discounts
Final Recommendation
Start immediately with FZROX and FZILX regardless of account size. Add FXNAX when your portfolio reaches $500. The zero expense ratio funds are particularly compelling for:
- Young investors building initial positions
- Educational accounts (UTMA/UGMA)
- Portfolio completion for existing holdings
- Experimental allocations without commitment
Implementation Steps:
- Open Fidelity account online (5-10 minutes)
- Set up automatic bank transfers
- Enable automatic investments into chosen funds
- Schedule quarterly allocation reviews
The elimination of minimum investments represents the most significant advancement in democratized investing since the invention of the index fund itself. Fidelity hasn’t just lowered costs—they’ve eliminated the very concept of being priced out of the market.
